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1 --- |
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2 layout: default |
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3 --- |
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4 |
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5 <pre> |
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6 Summary of important user-visible changes for version 5 (2019-02-23): |
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7 -------------------------------------------------------------------- |
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8 |
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9 ** The determination of an object's dimensions, size, and shape by the |
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10 functions ndims, rows, columns, isscalar, isvector, isrow, iscolumn, |
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11 ismatrix, and issquare now fully depends on the function size. |
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12 Thus, any user-defined object can ensure correct treatment by the |
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13 aforementioned functions by properly overloading the "size" |
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14 function. |
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15 |
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16 ** The function randi has been recoded to produce an unbiased (all |
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17 results are equally likely) sample of integers. This may produce |
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18 different results in existing code. If it is necessary to reproduce |
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19 the exact random integer sequence as in previous versions use |
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20 |
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21 ri = imin + floor ((imax - imin + 1) * rand ()); |
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22 |
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23 ** A new core function movfun will apply a function to a sliding |
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24 window of arbitrary size on a dataset and accumulate the results. |
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25 Many common cases have been implemented using the naming |
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26 scheme movXXX where "XXX" is the function that will be applied. |
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27 For example, the moving average over a dataset is movmean. |
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28 New moving window functions: |
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29 |
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30 movfun movslice |
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31 movmad movmax movmean movmedian movmin movprod |
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32 movstd movsum movvar |
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33 |
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34 ** The functions issymmetric and ishermitian accept an option "nonskew" |
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35 or "skew" to calculate the symmetric or skew-symmetric property |
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36 of a matrix. Performance has also been increased. |
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37 |
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38 ** The function isdefinite now returns true or false rather than |
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39 -1, 0, 1. To test for a positive semi-definite matrix (old output |
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40 of 0) check whether the following two conditions hold: |
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41 |
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42 isdefinite (A) => 0 |
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43 isdefinite (A + 5*TOL, TOL) => 1 |
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44 |
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45 ** The issorted function now uses a direction option of "ascend" or |
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46 "descend" to make it compatible with both the sort function and |
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47 with Matlab. Change all uses of "ascending" and "descending" in |
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48 existing code to the new options. |
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49 |
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50 ** The strncmp and strncmpi functions now return true if the two input |
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51 strings match, even though the number of characters specified by N |
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52 exceeds the string length. This behavior more closely matches |
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53 common sense and is Matlab compatible. Example: |
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54 |
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55 Octave 5 : strncmp ("abc", "abc", 100) => true |
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56 Previously : strncmp ("abc", "abc", 100) => false |
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57 |
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58 ** The intmax, intmin, and flintmax functions now accept a variable |
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59 as input. This supports a common programming usage which is to |
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60 query the range of an existing variable. Existing code can be |
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61 simplified by removing the call to "class" that was previously |
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62 required. Example: |
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63 |
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64 x = int8 (3); |
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65 Octave 5 : range = [ intmin(x), intmax(x) ] |
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66 Previously : range = [ intmin(class(x)), intmax(class(x)) ] |
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67 |
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68 ** The ranks function has been recoded for performance and is now 25X |
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69 faster. In addition, it now supports a third argument that |
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70 specifies how to resolve the ranking of tie values. |
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71 |
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72 ** The fsolve function has been tweaked to use larger step sizes when |
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73 calculating the Jacobian of a function with finite differences. |
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74 This leads to faster convergence. The default solver options have |
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75 also changed to be Matlab compatible. This *may* result in existing |
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76 code producing different results. |
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77 |
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78 Option | New Default | Old Default |
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79 ------------------------------------------------ |
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80 FinDiffType | "forward" | "central" |
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81 MaxFunEvals | 100*length(x0) | Inf |
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82 TolFun | 1e-6 | 1e-7 |
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83 TolX | 1e-6 | 1e-7 |
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84 Updating | "off" | "on" |
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85 |
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86 ** The fminsearch function has changed default solver options for |
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87 Matlab compatibility. The accuracy option TolFun is now 1e-4 rather |
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88 than 1e-7. This *may* result in existing code producing different |
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89 results. |
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90 |
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91 ** The fminbnd function has changed defaults for Matlab compatibility. |
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92 This *may* result in existing code producing different results. |
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93 |
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94 Option | New Default | Old Default |
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95 ------------------------------------------------ |
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96 MaxFunEvals | 500 | Inf |
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97 MaxIter | 500 | Inf |
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98 TolX | 1e-4 | 1e-8 |
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99 |
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100 ** The fminunc function has changed defaults for Matlab compatibility. |
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101 This *may* result in existing code producing different results. |
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102 |
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103 Option | New Default | Old Default |
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104 ------------------------------------------------ |
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105 FinDiffType | "forward" | "central" |
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106 MaxFunEvals | 100*length(x0) | Inf |
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107 TolX | 1e-6 | 1e-7 |
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108 TolFun | 1e-6 | 1e-7 |
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109 |
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110 ** Using "clear" with no arguments now removes only local variables |
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111 from the current workspace. Global variables will no longer be |
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112 visible, but they continue to exist in the global workspace and |
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113 possibly other workspaces such as the base workspace. |
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114 This change was made for Matlab compatibility. |
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115 |
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116 ** The Octave plotting system now supports high resolution screens, |
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117 i.e, those with greater than 96 DPI which are referred to as |
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118 HiDPI/Retina monitors. |
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119 |
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120 ** Figure graphic objects have a new property "Number" which is |
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121 read-only and will return the handle (number) of the figure. |
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122 However, if the property "IntegerHandle" has been set to "off" then |
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123 the property will return an empty matrix ([]). |
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124 |
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125 ** Patch and surface graphic objects now use the "FaceNormals" property |
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126 for flat lighting. |
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127 |
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128 ** "FaceNormals" and "VertexNormals" for patch and surface graphic |
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129 objects are now calculated only when necessary to improve graphics |
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130 performance. In order for any normals to be calculated the |
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131 "FaceLighting" property must be set to "flat" (FaceNormals) or |
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132 "gouraud" (VertexNormals), AND a light object must be present in the |
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133 axes. |
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134 |
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135 ** The "Margin" property of text() objects has a new default of 3 |
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136 rather than 2. This change was made for Matlab compatibility. |
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137 |
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138 ** Printing to raster formats (bitmaps like PNG or JPEG) now uses an |
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139 OpenGL-based method by default. The print options "-opengl" |
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140 (raster) and "-painters" (vector) have been added ("qt" toolkit |
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141 only). The figure property "renderer" specifies which renderer to |
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142 use. When the property "renderermode" is "auto" Octave will select |
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143 -opengl for a raster output format and -painters for a vector output |
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144 format. |
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145 |
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146 ** A new print option "-RGBImage" has been added which captures the |
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147 pixels of a figure as an image. This is similar to screen capture |
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148 tools, except that print formatting options can be used to, for |
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149 example, change the resolution or display the image in black and |
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150 white. |
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151 |
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152 ** Two new print options for page-based formats (PDF, PostScript) have |
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153 been added. The "-fillpage" option will stretch the plot to occupy |
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154 the entire page with 0.25 inch margins all around. The "-bestfit" |
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155 option will expand the plot to take up as much room as possible on |
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156 the page without distorting the original aspect ratio of the plot. |
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157 |
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158 ** Printing using the -dtiff output device will now create compressed |
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159 images using LZW compression. This change was made for Matlab |
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160 compatibility. To produce uncompressed images use the -dtiffn |
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161 device. |
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162 |
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163 ** A new printing device is available, -ddumb, which produces ASCII art |
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164 for plots. This device is only available with the gnuplot toolkit. |
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165 |
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166 ** Specifying legend position with a numeric argument is deprecated and |
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167 will be removed in Octave 7.0. Use a string argument instead. |
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168 |
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169 ** It is now possible to use files and folders containing Unicode |
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170 characters in Windows. |
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171 |
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172 ** The environment variable used by mkoctfile for linker flags is now |
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173 LDFLAGS rather than LFLAGS. LFLAGS is deprecated, and a warning |
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174 is emitted if is used, but it will continue to work until eventual |
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175 removal in Octave 7.0. |
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176 |
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177 ** The GUI requires Qt libraries. The minimum Qt4 version supported is |
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178 Qt4.8. Qt5 of any version is preferred. |
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179 |
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180 ** The FFTW library is now required to perform FFT calculations. |
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181 The FFTPACK sources have been removed from Octave. |
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182 |
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183 ** The OSMesa library is no longer used. To print invisible figures |
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184 when using OpenGL graphics, the Qt QOFFSCREENSURFACE feature must be |
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185 available and you must use the qt graphics toolkit. |
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186 |
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187 ** The str2func function no longer accepts a second "global" argument. |
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188 This argument was typically used to allow functions that accept |
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189 function names as arguments to avoid conflicts with subfunctions or |
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190 nested functions. Instead, it's best to avoid this situation |
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191 entirely and require users to pass function handles rather than |
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192 function names. |
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193 |
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194 ** The path handling functions no longer perform variable or brace |
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195 expansion on path elements and Octave's load-path is no longer |
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196 subject to these expansions. |
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197 |
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198 ** New functions added in 5: |
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199 |
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200 clearvars |
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201 isfile |
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202 isfolder |
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203 matlab.lang.makeUniqueStrings |
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204 matlab.lang.makeValidName |
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205 movegui |
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206 movfun |
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207 movie |
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208 movmad |
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209 movmax |
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210 movmean |
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211 movmedian |
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212 movmin |
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213 movprod |
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214 movslice |
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215 movstd |
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216 movsum |
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217 movvar |
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218 openfig |
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219 ordeig |
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220 savefig |
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221 uitable |
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222 |
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223 ** Legacy functions. |
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224 |
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225 The following functions have been declared legacy functions which |
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226 means they are obsolete and should not be used in any new code. |
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227 Unlike deprecated functions, however, their removal from Octave has |
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228 not yet been scheduled. |
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229 |
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230 Function | Replacement |
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231 ---------------------|------------------ |
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232 findstr | strfind |
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233 flipdim | flip |
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234 isdir | isfolder or dir_in_loadpath |
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235 isequalwithequalnans | isequaln |
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236 isstr | ischar |
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237 setstr | char |
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238 strmatch | strncmp or strcmp |
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239 strread | textscan |
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240 textread | textscan |
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241 |
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242 ** Deprecated functions. |
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243 |
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244 The following functions have been deprecated in Octave 5 and will |
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245 be removed from Octave 7 (or whatever version is the second major |
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246 release after 5): |
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247 |
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248 Function | Replacement |
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249 -----------------------|------------------ |
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250 output_max_field_width | output_precision |
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251 |
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252 ** The following functions were deprecated in Octave 4.2 and have been |
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253 removed from Octave 5. |
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254 |
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255 Function | Replacement |
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256 ---------------------|------------------ |
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257 bitmax | flintmax |
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258 mahalanobis | mahal in Octave Forge statistics pkg |
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259 md5sum | hash |
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260 octave_config_info | __octave_config_info__ |
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261 onenormest | normest1 |
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262 sleep | pause |
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263 usleep | pause |
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264 wavread | audioread |
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265 wavwrite | audiowrite |
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266 |
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267 ** Deprecated graphics properties. |
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268 |
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269 The following properties or allowed corresponding values have been |
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270 deprecated in Octave 5 and will be removed from Octave 7 (or |
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271 whatever version is the second major release after 5): |
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272 |
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273 Object | Property | Value |
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274 ---------------------|-------------------------|------------------- |
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275 text | fontangle | "oblique" |
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276 uibuttongroup | fontangle | "oblique" |
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277 uicontrol | fontangle | "oblique" |
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278 uipanel | fontangle | "oblique" |
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279 uitable | fontangle | "oblique" |
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280 |
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281 ** The following properties or allowed corresponding values were |
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282 deprecated in Octave 4.2 and have been removed from Octave 5: |
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283 |
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284 Object | Property | Value |
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285 ---------------------|-------------------------|------------------- |
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286 axes | xaxislocation | "zero" |
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287 | yaxislocation | "zero" |
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288 hggroup | erasemode | |
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289 image | erasemode | |
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290 line | erasemode | |
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291 patch | erasemode | |
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292 patch | normalmode | |
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293 surface | erasemode | |
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294 surface | normalmode | |
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295 text | erasemode | |
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296 |
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297 ** The C++ function is_keyword has been deprecated in favor of |
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298 iskeyword. The old function will be removed two versions after 5. |
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299 |
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300 --------------------------------------------------------- |
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301 |
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302 See NEWS.4 for old news. |
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303 </pre> |
