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mean: Process single as double to avoid precision limits on stable (bug #63848). * mean.m: Change all sum calls to process as "double" to avoid single precision limits from producing erroneous output. Update output conversion block to preserve single output for 'default' after forcing double processing and replace expensive call to cast with feval in 'native'. Add BISTs to test calls to sum that could lose precision. Add xfail BIST showing the same problem with large doubles. * NEWS.8.md: Update description of changes to mean.m.
author Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
date Thu, 02 Mar 2023 21:42:42 -0500
parents 74aa32d5fd08
children fc40c78a8421 75b1efe727d4
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1 Summary of important user-visible changes for version 8 (2023-01-22):
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2 --------------------------------------------------------------------
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3
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4 ### General improvements
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5
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6 - Octave's libraries are now built using symbol visibility by default.
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7 That means that fewer symbols are exported from these libraries.
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8 Configure with `--disable-lib-visibility-flags` to export all symbols
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9 (as in previous versions).
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10
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11 - `filter` is now 5X faster, which also speeds up `deconv`, `fftfilt`
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12 and `arma_rnd` by the same amount.
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13
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14 - `integral` can now output a second argument passing the error
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15 measurement used by the underlying integrator.
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16
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17 - `perms` now accepts a second argument "unique" to return only unique
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18 permutations for inputs with repeated elements. It is faster and
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19 takes less memory to call `perms ('aaaabbbbcccc', "unique")` than to
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20 call `unique (perms ('aaaabbbbcccc'), "rows")`.
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22 - `quadgk` can now accept the `ArrayValued` input parameter to handle
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23 array-valued input functions.
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24
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25 - `delaunayn` now has consistent trivial simplex checking and removal
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26 for all input dimensions, simplex checking 3D inputs is now
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27 vectorized, and >3D simplex checking performance has been improved.
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28 Simplexes points are now ordered so they will all have positive
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29 outward normal vectors. Input type checking has also been added for
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30 improved error handling.
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31
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32 - `factor` now factorizes all 64-bit integers in roughly the same time.
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33 Previously, the product of two large primes took much longer to factorize
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34 than highly composite inputs.
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35
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36 - `Refine` option is now implemented in functions `ode45`, `ode23`,
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37 and `ode23s`.
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38
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39 - Octave is now compatible with PCRE2 (UTF-8). PCRE2 is preferred over PCRE
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40 if both are installed. Configure with `--without-pcre2` if you prefer Octave
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41 to use PCRE in this case.
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42
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43 - `mean` now internally processes data as type double to reduce liklihood of
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44 hitting overflow or precision limits with other types (bug #63848).
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45
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46 ### Graphical User Interface
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47
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48 - The GUI has a dark style and several new icons in toolbars for better
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49 visibility and higher contrast.
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51 - A new terminal widget has been added for the GUI. It is still experimental
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52 and is disabled by default. It can be enabled with the command line
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53 parameter `--experimental-terminal-widget`.
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54
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55 - More fonts for the documentation browser are included.
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56
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57 ### Graphics backend
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58
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59 - When printing, the option `-svgconvert` is now the default. If you want to
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60 use the more limited EPS-based tool chain (the former default)&mdash;e.g., if
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61 you encounter inaccurate image rendering&mdash;you can pass the `-nosvgconvert`
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62 option to the `print` function.
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63
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64 - Additional properties have been added to the `figure` graphics object:
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65 * `"innerposition"` (equivalent to `"position"`)
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66 * `"windowstate"` (not yet implemented)
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67
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68 - Legend now features a new property `"itemhitfcn"`, allowing the
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69 execution of a callback function when a legend item is clicked.
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70
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71 ### Matlab compatibility
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72
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73 - `inline` functions now support all Matlab methods. The performance
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74 of `inline` functions has also been improved.
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75
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76 - `sub2ind` now supports index values outside of the size specified by
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77 the subscripts.
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78
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79 - `cylinder` now accepts a scalar for the radius argument.
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80
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81 - `clock` now has an optional second output `ISDST` which indicates if
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82 Daylight Savings Time is in effect for the system's time zone.
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84 - `print` now accepts option `-image` to specify the "opengl" renderer
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85 and `-vector` to specify the "painters" renderer.
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86
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87 - `format` now accepts the option "default", which is equivalent to
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88 calling `format` without any options to reset the default state.
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89
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90 - `quadgk` now stops iterating when `error <= tolerance` while the previous
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91 condition was `error < tolerance`.
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92
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93 - `mean` now accepts vector dimensions and options to handle `NaN` values.
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94 The option `"a"` (arithmetic mean), `"g"` (geometric mean), and `"h"`
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95 (harmonic mean) are no longer accepted, only the arithmetic mean is computed.
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96 For the geometric and harmonic mean, please use respective functions
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97 `geomean` and `harmmean` from the Octave Statistics package.
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98
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99 - `var` and `std` now optionally output a second argument containing the mean
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100 or weighted mean.
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101
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102 - `integral` can now accept the 'ArrayValued' option in combination with
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103 'RelTol' and 'WayPoints'.
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104
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105 - File system operations that remove files (e.g., `unlink` or `rmdir`) now also
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106 remove files that have their read-only file attribute set on Windows.
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108 - The default state for certain graphics properties has been made
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109 consistent with Matlab.
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110
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111 Object | Property | Default State
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112 ------------|------------------|------------
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113 figure | "dockcontrols" | "on"
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114
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115 - `ode45`, `ode23`, and `ode23s` have improved results for options `Events`,
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116 `OutputFcn`, and `Refine`, along with corrected orientation of struct
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117 outputs.
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119 - *Early notice of future breaking changes*: Due to many user requests that
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120 Octave should have a Matlab-compatible string class, there is work under way
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121 to implement a string class that will differ from a vector of characters. In
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122 Octave, single-quoted character arrays are currently compatible with Matlab,
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123 but double-quoted forms are not. Currently in Octave, both 'foo' and "foo"
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124 are largely interchangeable, barring certain escape sequence interpretations
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125 such as "\n" (converted to a single newline character) as opposed to '\n'
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126 (two separate characters). Matlab’s single-quoted character arrays and
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127 double-quoted strings do not process backslash escape sequences, unlike many
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128 other languages, and those escape sequences are instead processed by
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129 individual functions such as `fprintf`.
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130
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131 Octave's behavior is likely to change in future as a consequence of
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132 implementing Matlab-style string syntax. For example, 'foo' will remain a
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133 three-element character vector, but "foo" will become a single-element string
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134 object. Some backslash escape sequences are likely to differ from their
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135 current Octave behavior, but will achieve greater Matlab compatibility. The
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136 exact implementation is a work in progress, and may or may not include
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137 methods of preserving backward compatibility.
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138
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139 *What this means for user code*: If your code currently relies on
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140 double-quoted strings (e.g., "foo") representing character vectors as
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141 opposed to string objects, and if you intend to update to a future version of
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142 Octave incorporating the above changes, then consider replacing all
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143 double-quoted strings with single-quoted strings in your code over time
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144 (e.g., replace "foo" with 'foo'). Single-quoted strings are expected to
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145 retain current behavior. Further, if your code relies on backslash escape
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146 sequence interpretation in double-quoted strings (except for special cases
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147 like the `printf` family), that code may need to change as well.
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148
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149 ### Alphabetical list of new functions added in Octave 8
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150
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151 * `clearAllMemoizedCaches`
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152 * `matlab.lang.MemoizedFunction`
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153 * `memoize`
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154 * `normalize`
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155 * `pagectranspose`
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156 * `pagetranspose`
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157 * `uifigure`
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158
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159 ### Deprecated functions, properties, and operators
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160
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161 The following functions and properties have been deprecated in Octave 8
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162 and will be removed from Octave 10 (or whatever version is the second
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163 major release after 8):
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164
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165 - Functions
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166
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167 Function | Replacement
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168 -----------------------|------------------
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169 shift | circshift
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170 sparse_auto_mutate | none (see below)
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171
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172 - The `sparse_auto_mutate` function no longer has any effect on Octave's
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173 behavior. Previously, after calling `sparse_auto_mutate (true)`,
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174 Octave would automatically convert sparse matrices to full when a
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175 sparse matrix required more memory than simply using full matrix
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176 storage. This setting was `false` by default for compatibility with
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177 Matlab. Now you must manually convert to full storage when desired.
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178
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179 - Properties
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180
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181 The following property names are discouraged, but there is no fixed
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182 date for their removal.
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183
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184 Object | Property | Replacement
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185 -----------------|-------------|------------
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186 uimenu | label | text
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187 uimenu | callback | menuselectedfcn
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188
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189 The following functions were deprecated in Octave 6 and have been removed
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190 from Octave 8.
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191
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192 - Functions
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193
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194 Function | Replacement
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195 -------------|------------
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196 runtests | oruntests
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197
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198 - The environment variable used by `mkoctfile` for linker flags is now
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199 `LDFLAGS` rather than `LFLAGS`. `LFLAGS` was deprecated in Octave 6,
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200 and will be removed in a future version of Octave.
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201
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202 Summary of bugs fixed for version 8.1.0 (2023-01-22):
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203 ----------------------------------------------------
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204
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205 - Improved input validation and/or output handling for `poly`, `pinv`, `patch`,
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206 `fill`, `fill3`, `qp`, `datevec`, `textscan`, `sub2ind`, `qr`, `airy`,
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207 `regexp`, `dec2bin`, `dec2hex`, `mean`, and many others.
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208 - Improved performance for `complex`, `fftw`, `delaunayn`, `isfield`, `tsearch`,
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209 sparse matrix exponentiation, other sparse operations, and many others.
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210 - Overhauled `@audiorecorder` and `@audioplayer` classes.
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211
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212 ### Old release news
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213
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214 - [Octave 7.x](etc/NEWS.7)
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215 - [Octave 6.x](etc/NEWS.6)
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216 - [Octave 5.x](etc/NEWS.5)
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217 - [Octave 4.x](etc/NEWS.4)
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218 - [Octave 3.x](etc/NEWS.3)
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219 - [Octave 2.x](etc/NEWS.2)
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220 - [Octave 1.x](etc/NEWS.1)