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Merged closed branch "kai" into default.
author Kai T. Ohlhus <k.ohlhus@gmail.com>
date Tue, 01 Nov 2016 01:06:10 +0100
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94
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1 <pre>
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2 Summary of important user-visible changes for version 3.4.3:
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3 -----------------------------------------------------------
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4
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5 ** Octave 3.4.3 is a bug fixing release.
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6
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7 Summary of important user-visible changes for version 3.4.2:
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8 -----------------------------------------------------------
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9
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10 ** Octave 3.2.4 fixes some minor installation problems that affected
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11 version 3.4.1.
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12
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13 Summary of important user-visible changes for version 3.4.1:
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14 -----------------------------------------------------------
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15
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16 ** Octave 3.4.1 is primarily a bug fixing release.
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17
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18 ** IMPORTANT note about binary incompatibility in this release:
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19
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20 Binary compatibility for all 3.4.x releases was originally planned,
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21 but this is impossible for the 3.4.1 release due to a bug in the way
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22 shared libraries were built in Octave 3.4.0. Because of this bug,
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23 .oct files built for Octave 3.4.0 must be recompiled before they
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24 will work with Octave 3.4.1.
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25
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26 Given that there would be binary incompatibilities with shared
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27 libraries going from Octave 3.4.0 to 3.4.1, the following
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28 incompatible changes were also made in this release:
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29
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30 * The Perl Compatible Regular Expression (PCRE) library is now
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31 required to build Octave.
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32
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33 * Octave's libraries and .oct files are now installed in
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34 subdirectories of $libdir instead of $libexecdir.
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35
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36 Any future Octave 3.4.x release versions should remain binary
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37 compatible with Octave 3.4.1 as proper library versioning is now
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38 being used as recommended by the libtool manual.
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39
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40 ** The following functions have been deprecated in Octave 3.4.1 and will
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41 be removed from Octave 3.8 (or whatever version is the second major
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42 release after 3.4):
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43
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44 cquad is_duplicate_entry perror strerror
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45
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46 ** The following functions are new in 3.4.1:
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47
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48 colstyle gmres iscolumn isrow mgorth nproc rectangle
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49
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50 ** The get_forge_pkg function is now private.
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51
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52 ** The rectangle_lw, rectangle_sw, triangle_lw, and triangle_sw
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53 functions are now private.
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54
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55 ** The logistic_regression_derivatives and logistic_regression_likelihood
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56 functions are now private.
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57
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58 ** ChangeLog files in the Octave sources are no longer maintained
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59 by hand. Instead, there is a single ChangeLog file generated from
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60 the Mercurial version control commit messages. Older ChangeLog
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61 information can be found in the etc/OLD-ChangeLogs directory in the
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62 source distribution.
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63
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64 Summary of important user-visible changes for version 3.4:
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65 ---------------------------------------------------------
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66
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67 ** BLAS and LAPACK libraries are now required to build Octave. The
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68 subset of the reference BLAS and LAPACK libraries has been removed
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69 from the Octave sources.
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70
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71 ** The `lookup' function was extended to be more useful for
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72 general-purpose binary searching. Using this improvement, the
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73 ismember function was rewritten for significantly better
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74 performance.
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75
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76 ** Real, integer and logical matrices, when used in indexing, will now
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77 cache the internal index_vector value (zero-based indices) when
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78 successfully used as indices, eliminating the conversion penalty for
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79 subsequent indexing by the same matrix. In particular, this means it
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80 is no longer needed to avoid repeated indexing by logical arrays
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81 using find for performance reasons.
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82
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83 ** Logical matrices are now treated more efficiently when used as
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84 indices. Octave will keep the index as a logical mask unless the
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85 ratio of true elements is small enough, using a specialized
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86 code. Previously, all logical matrices were always first converted
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87 to index vectors. This results in savings in both memory and
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88 computing time.
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89
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90 ** The `sub2ind' and `ind2sub' functions were reimplemented as compiled
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91 functions for better performance. These functions are now faster,
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92 can deliver more economized results for ranges, and can reuse the
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93 index cache mechanism described in previous paragraph.
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94
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95 ** The built-in function equivalents to associative operators (`plus',
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96 `times', `mtimes', `and', and `or') have been extended to accept
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97 multiple arguments. This is especially useful for summing
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98 (multiplying, etc.) lists of objects (of possibly distinct types):
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99
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100 matrix_sum = plus (matrix_list{:});
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101
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102 ** An FTP object type based on libcurl has been implemented. These
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103 objects allow ftp connections, downloads and uploads to be
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104 managed. For example,
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105
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106 fp = ftp ("ftp.octave.org);
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107 cd (fp, "gnu/octave");
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108 mget (fp, "octave-3.2.3.tar.bz2");
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109 close (fp);
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110
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111 ** The default behavior of `assert (observed, expected)' has been
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112 relaxed to employ less strict checking that does not require the
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113 internals of the values to match. This avoids previously valid
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114 tests from breaking due to new internal classes introduced in future
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115 Octave versions.
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116
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117 For instance, all of these assertions were true in Octave 3.0.x
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118 but false in 3.2.x due to new optimizations and improvements:
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119
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120 assert (2*linspace (1, 5, 5), 2*(1:5))
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121 assert (zeros (0, 0), [])
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122 assert (2*ones (1, 5), (2) (ones (1,5)))
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123
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124 ** The behavior of library functions `ismatrix', `issquare', and
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125 `issymmetric' has been changed for better consistency.
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126
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127 * The `ismatrix' function now returns true for all numeric,
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128 logical and character 2-D or N-D matrices. Previously, `ismatrix'
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129 returned false if the first or second dimension was zero.
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130 Hence, `ismatrix ([])' was false,
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131 while `ismatrix (zeros (1,2,0))' was true.
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132
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133 * The `issquare' function now returns a logical scalar, and is
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134 equivalent to the expression
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135
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136 ismatrix (x) && ndims (x) == 2 && rows (x) == columns (x)
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137
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138 The dimension is no longer returned. As a result, `issquare ([])'
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139 now yields true.
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140
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141 * The `issymmetric' function now checks for symmetry instead of
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142 Hermitianness. For the latter, ishermitian was created. Also,
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143 logical scalar is returned rather than the dimension, so
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144 `issymmetric ([])' is now true.
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145
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146 ** Function handles are now aware of overloaded functions. If a
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147 function is overloaded, the handle determines at the time of its
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148 reference which function to call. A non-overloaded version does not
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149 need to exist.
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150
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151 ** Overloading functions for built-in classes (double, int8, cell,
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152 etc.) is now compatible with Matlab.
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153
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154 ** Function handles can now be compared with the == and != operators,
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155 as well as the `isequal' function.
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156
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157 ** Performance of concatenation (using []) and the functions `cat',
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158 `horzcat', and `vertcat' has been improved for multidimensional
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159 arrays.
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160
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161 ** The operation-assignment operators +=, -=, *= and /= now behave more
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162 efficiently in certain cases. For instance, if M is a matrix and S a
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163 scalar, then the statement
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164
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165 M += S;
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166
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167 will operate on M's data in-place if it is not shared by another
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168 variable, usually increasing both time and memory efficiency.
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169
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170 Only selected common combinations are affected, namely:
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171
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172 matrix += matrix
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173 matrix -= matrix
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174 matrix .*= matrix
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175 matrix ./= matrix
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176
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177 matrix += scalar
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178 matrix -= scalar
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179 matrix *= scalar
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180 matrix /= scalar
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181
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182 logical matrix |= logical matrix
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183 logical matrix &= logical matrix
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184
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185 where matrix and scalar belong to the same class. The left-hand
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186 side must be a simple variable reference.
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187
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188 Moreover, when unary operators occur in expressions, Octave will
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189 also try to do the operation in-place if it's argument is a
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190 temporary expresssion.
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191
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192 ** The effect of comparison operators (<, >, <=, and >=) applied to
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193 complex numbers has changed to be consistent with the strict
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194 ordering defined by the `max', `min', and `sort' functions. More
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195 specifically, complex numbers are compared by lexicographical
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196 comparison of the pairs `[abs(z), arg(z)]'. Previously, only real
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197 parts were compared; this can be trivially achieved by wrapping the
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198 operands in real().
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199
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200 ** The automatic simplification of complex computation results has
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201 changed. Octave will now simplify any complex number with a zero
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202 imaginary part or any complex matrix with all elements having zero
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203 imaginary part to a real value. Previously, this was done only for
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204 positive zeros. Note that the behavior of the complex function is
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205 unchanged and it still produces a complex value even if the
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206 imaginary part is zero.
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207
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208 ** As a side effect of code refactoring in liboctave, the binary
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209 logical operations are now more easily amenable to compiler
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210 optimizations and are thus significantly faster.
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211
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212 ** Octave now allows user-defined `subsasgn' methods to optimize out
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213 redundant copies. For more information, see the manual.
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214
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215 ** More efficient matrix division handling. Octave is now able to
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216 handle the expressions
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217
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218 M' \ V
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219 M.' \ V
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220 V / M
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221
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222 (M is a matrix and V is a vector) more efficiently in certain cases.
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223 In particular, if M is triangular, all three expressions will be
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224 handled by a single call to xTRTRS (from LAPACK), with appropriate
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225 flags. Previously, all three expressions required a physical
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226 transpose of M.
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227
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228 ** More efficient handling of certain mixed real-complex matrix
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229 operations. For instance, if RM is a real matrix and CM a complex
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230 matrix,
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231
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232 RM * CM
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233
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234 can now be evaluated either as
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235
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236 complex (RM * real (CM), RM * imag (CM))
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237
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238 or as
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239
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240 complex (RM) * CM,
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241
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242 depending on the dimensions. The first form requires more
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243 temporaries and copying, but halves the FLOP count, which normally
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244 brings better performance if RM has enough rows. Previously, the
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245 second form was always used.
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246
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247 Matrix division is similarly affected.
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248
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249 ** More efficient handling of triangular matrix factors returned from
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250 factorizations. The functions for computing QR, LU and Cholesky
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251 factorizations will now automatically return the triangular matrix
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252 factors with proper internal matrix_type set, so that it won't need
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253 to be computed when the matrix is used for division.
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254
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255 ** The built-in `sum' function now handles the non-native summation
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256 (i.e., double precision sum of single or integer inputs) more
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257 efficiently, avoiding a temporary conversion of the whole input
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258 array to doubles. Further, `sum' can now accept an extra option
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259 argument, using a compensated summation algorithm rather than a
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260 straightforward sum, which significantly improves precision if lots
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261 of cancellation occurs in the summation.
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262
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263 ** The built-in `bsxfun' function now uses optimized code for certain
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264 cases where built-in operator handles are passed in. Namely, the
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265 optimizations concern the operators `plus', `minus', `times',
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266 `ldivide', `rdivide', `power', `and', `or' (for logical arrays),
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267 the relational operators `eq', `ne', `lt', `le', `gt', `ge', and the
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268 functions `min' and `max'. Optimizations only apply when both
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269 operands are of the same built-in class. Mixed real/complex and
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270 single/double operations will first convert both operands to a
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271 common type.
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272
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273 ** The `strfind' and `strrep' functions now have compiled
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274 implementations, facilitating significantly more efficient searching
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275 and replacing in strings, especially with longer patterns. The code
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276 of `strcat' has been vectorized and is now much more efficient when
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277 many strings are concatenated. The `strcmpi' and `strncmpi'
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278 functions are now built-in functions, providing better performance.
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279
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280 ** Matlab-style ignoring input and output function arguments using
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281 tilde (~) is now supported. Ignored output arguments may be
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282 detected from a function using the built-in function `isargout'.
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283 For more details, consult the manual.
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284
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285 ** The list datatype, deprecated since the introduction of cells, has
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286 been removed.
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287
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288 ** The accumarray function has been optimized and is now significantly
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289 faster in certain important cases.
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290
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291 ** The behavior of isreal and isnumeric functions was changed to be more
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292 Matlab-compatible.
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293
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294 ** The integer math & conversion warnings (Octave:int-convert-nan,
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295 Octave:int-convert-non-int-val, Octave:int-convert-overflow,
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296 Octave:int-math-overflow) have been removed.
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297
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298 ** rem and mod are now built-in functions. They also handle integer
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299 types efficiently using integer arithmetic.
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300
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301 ** Sparse indexing and indexed assignment has been mostly rewritten.
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302 Since Octave uses compressed column storage for sparse matrices,
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303 major attention is devoted to operations manipulating whole columns.
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304 Such operations are now significantly faster, as well as some other
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305 important cases.
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306
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307 Further, it is now possible to pre-allocate a sparse matrix and
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308 subsequently fill it by assignments, provided they meet certain
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309 conditions. For more information, consult the `spalloc' function,
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310 which is no longer a mere dummy. Consequently, nzmax and nnz are no
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311 longer always equal in Octave. Octave may also produce a matrix
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312 with nnz < nzmax as a result of other operations, so you should
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313 consistently use nnz unless you really want to use nzmax (i.e. the
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314 space allocated for nonzero elements).
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315
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316 Sparse concatenation is also affected, and concatenating sparse
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317 matrices, especially larger collections, is now significantly more
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318 efficient. This applies to both the [] operator and the
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319 cat/vertcat/horzcat functions.
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320
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321 ** It is now possible to optionally employ the xGESDD LAPACK drivers
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322 for computing the singular value decomposition using svd(), instead
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323 of the default xGESVD, using the configuration pseudo-variable
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324 svd_driver. The xGESDD driver can be up to 6x times faster when
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325 singular vectors are requested, but is reported to be somewhat less
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326 robust on highly ill-conditioned matrices.
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327
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328 ** Configuration pseudo-variables, such as page_screen_output or
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329 confirm_recursive_rmdir (or the above mentioned svd_driver), now
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330 accept a "local" option as second argument, requesting the change
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331 to be undone when the current function returns:
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332
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333 function [status, msg] = rm_rf (dir)
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334 confirm_recursive_rmdir (false, "local");
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335 [status, msg] = rmdir (dir, "s");
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336 ...
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337 endfunction
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338
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339 Upon return, confirm_recursive_rmdir will be restored to the value
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340 it had on entry to the function, even if there were subsequent
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341 changes to the variable in function rm_rf or any of the functions
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342 it calls.
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343
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344 ** pkg now accepts a -forge option for downloading and installing
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345 packages from Octave Forge automatically. For example,
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346
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347 pkg install -forge general
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348
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349 will automatically download the latest release of the general
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350 package and attempt to install it. No automatic resolving of
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351 dependencies is provided. Further,
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352
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353 pkg list -forge
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354
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355 can be used to list all available packages.
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356
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357 ** The internal data representation of structs has been completely
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358 rewritten to make certain optimizations feasible. The field data
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359 can now be shared between structs with equal keys but different
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360 dimensions or values, making operations that preserve the fields
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361 faster. Economized storage is now used for scalar structs (just
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362 like most other scalars), making their usage more
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363 memory-efficient. Certain array-like operations on structs
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364 (concatenation, uniform cellfun, num2cell) have gained a
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365 significant speed-up. Additionally, the octave_scalar_map class
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366 now provides a simpler interface to work with scalar structs within
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367 a C++ DLD function.
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368
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369 ** Two new formats are available for displaying numbers:
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370
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371 format short eng
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372 format long eng
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373
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374 Both display numbers in engineering notation, i.e., mantissa +
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375 exponent where the exponent is a multiple of 3.
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376
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377 ** The following functions are new in Octave 3.4:
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378
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379 accumdim erfcx nfields pqpnonneg uigetdir
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380 bitpack fileread nth_element quadcc uigetfile
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381 bitunpack fminbnd onCleanup randi uiputfile
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382 blkmm fskipl pbaspect repelems uimenu
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383 cbrt ifelse pie3 reset whitebg
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384 curl ishermitian powerset rsf2csf
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385 chop isindex ppder saveas
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386 daspect luupdate ppint strread
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387 divergence merge ppjumps textread
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388
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389 ** Using the image function to view images with external programs such
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390 as display, xv, and xloadimage is no longer supported. The
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391 image_viewer function has also been removed.
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392
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393 ** The behavior of struct assignments to non-struct values has been
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394 changed. Previously, it was possible to overwrite an arbitrary
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395 value:
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396
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397 a = 1;
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398 a.x = 2;
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399
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400 This is no longer possible unless a is an empty matrix or cell
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401 array.
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402
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403 ** The dlmread function has been extended to allow specifying a custom
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404 value for empty fields.
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405
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406 ** The dlmread and dlmwrite functions have been modified to accept
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407 file IDs (as returned by fopen) in addition to file names.
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408
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409 ** Octave can now optimize away the interpreter overhead of an
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410 anonymous function handle, if the function simply calls another
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411 function or handle with some of its parameters bound to certain
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412 values. Example:
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413
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414 f = @(x) sum (x, 1);
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415
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416 When f is called, the call is forwarded to @sum with the constant 1
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417 appended, and the anonymous function call does not occur on the
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418 call stack.
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419
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420 ** Deprecated functions.
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421
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422 The following functions were deprecated in Octave 3.0 and have been
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423 removed from Octave 3.4.
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424
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425 beta_cdf geometric_pdf pascal_pdf
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426 beta_inv geometric_rnd pascal_rnd
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427 beta_pdf hypergeometric_cdf poisson_cdf
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428 beta_rnd hypergeometric_inv poisson_inv
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429 binomial_cdf hypergeometric_pdf poisson_pdf
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430 binomial_inv hypergeometric_rnd poisson_rnd
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431 binomial_pdf intersection polyinteg
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432 binomial_rnd is_bool setstr
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433 chisquare_cdf is_complex struct_contains
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434 chisquare_inv is_list struct_elements
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435 chisquare_pdf is_matrix t_cdf
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436 chisquare_rnd is_scalar t_inv
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437 clearplot is_square t_pdf
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438 clg is_stream t_rnd
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439 com2str is_struct uniform_cdf
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440 exponential_cdf is_symmetric uniform_inv
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441 exponential_inv is_vector uniform_pdf
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442 exponential_pdf isstr uniform_rnd
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443 exponential_rnd lognormal_cdf weibcdf
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444 f_cdf lognormal_inv weibinv
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445 f_inv lognormal_pdf weibpdf
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446 f_pdf lognormal_rnd weibrnd
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447 f_rnd meshdom weibull_cdf
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448 gamma_cdf normal_cdf weibull_inv
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449 gamma_inv normal_inv weibull_pdf
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450 gamma_pdf normal_pdf weibull_rnd
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451 gamma_rnd normal_rnd wiener_rnd
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452 geometric_cdf pascal_cdf
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453 geometric_inv pascal_inv
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454
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455 The following functions were deprecated in Octave 3.2 and will
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456 be removed from Octave 3.6 (or whatever version is the second major
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457 release after 3.2):
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458
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459 create_set spcholinv splu
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460 dmult spcumprod spmax
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461 iscommand spcumsum spmin
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462 israwcommand spdet spprod
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463 lchol spdiag spqr
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464 loadimage spfind spsum
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465 mark_as_command sphcat spsumsq
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466 mark_as_rawcommand spinv spvcat
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467 spatan2 spkron str2mat
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468 spchol splchol unmark_command
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469 spchol2inv split unmark_rawcommand
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470
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471 The following functions have been deprecated in Octave 3.4 and will
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472 be removed from Octave 3.8 (or whatever version is the second major
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473 release after 3.4):
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474
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475 autocor cellidx gammai krylovb values
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476 autocov dispatch glpkmex replot
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477 betai fstat is_global saveimage
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478
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479 * For compatibility with Matlab, mu2lin (x) is now equivalent to
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480 mu2lin (x, 0).
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481
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482 * The ARPACK library is now distributed with Octave so it no longer
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483 needs to be available as an external dependency when building
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484 Octave.
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485 </pre>