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cov.m: Overhaul function for matlab compatibility (bug #50583). * cov.m: Change two-array input handling such that separate x and y inputs are treated as two univariate distributions equivalent to cov (x(:), y(:)). Implement NANFLAG option for selectively ignoring NaN data elements. Correct empty input handling to produce Matlab compatible output. Add BISTs for new features and expand input validation tests. Update docstring to address new behaviors and at note about backwards incompatibility. * corr.m, corrcoef.m: Adapt calls to cov to account for the increase in cov return size. * etc/NEWS.9.md: Add note of changes to Matlab Compatibility section.
author Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
date Wed, 22 Mar 2023 13:33:46 -0400
parents 655e757c7522
children 72d005398818
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1 Summary of important user-visible changes for version 9 (yyyy-mm-dd):
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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 - `oruntests`: The current directory now changes to the directory
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7 containing the files with the tests for the duration of the test. This
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8 aligns the behavior of this function with Octave's test suite. This also
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9 means that the file encoding specified in the `.oct-config` file for the
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10 respective directory is taken into account for the tests.
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11
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12 - `dec2base`, `dec2bin`, and `dec2hex` have all been overhauled. All three
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13 functions now accommodate negative inputs and fractional inputs, and repeated
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14 code between the functions has been reduced or eliminated. Previously only
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15 `dec2bin` and `dec2hex` accepted negative inputs but `dec2base` did not, and
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16 none of the three accepted fractional inputs. But now,
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17 `dec2base (100*pi, 16, 4, 6)` for exampele returns a base-16 string with four
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18 places for the integer part and six places for the fractional part. Omitting
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19 the number of decimal places (the fourth input) retains old behavior for
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20 backward compatibility, except that non-integer inputs will no longer error.
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21
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22 ### Graphical User Interface
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23
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24 ### Graphics backend
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25
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26 * the `set` function now accepts any combination of name/value pairs,
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27 cell array of names / cell array of values, or property structures.
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28 This change is Matlab-compatible.
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29
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30 ### Matlab compatibility
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31
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32 - Overhauled `mean`, `median`, `var`, and `std` functions have been imported
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33 from statistics package v1.5.4 to compatibly implement 'nanflag' (bug #50571),
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34 'all' (bug #58116), and 'vecdim' (bug #58089) options, preserve output class,
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35 and match expected output behavior for empty (bug #50583) and sparse inputs
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36 (bug #63291). Both `median` and `mean` can handle large int values without
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37 overflow or precision concerns (bug #54567), and `mean` avoids errors due to
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38 limits of single precision by processing as doubles (bug #63848). `median`
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39 has also adopted the 'outtype' option from `mean`.
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41 - `mode` now produces Matlab compatible output for empty inputs (bug #50583).
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42
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43 - `cov` now processes the input form cov(x,y) with two separate data arrays
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44 x and y, as cov(x(:),y(:)) to maintain Matlab compatibility. It also accepts
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45 a NANFLAG option to allow ignoring NaN entries in input data (bug #50571)
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46 and produces Matlab compatible outputs for empty inputs (bug #50583). `corr`
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47 and `corrcoef` internal code has been adapted to the new `cov` behavior with
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48 no change to user interface. Packages using the octave core's `cov` that rely
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49 on the previous calling form may need to make similar adaptations. Calls for
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50 cov(x) with a vector x expecting a scalar return can get the previous results
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51 from `cov(x)(2)`, and calls to cov(x,y) with x and y matrices expecting
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52 columnwise covariance calculation can obtain the previous results using
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53 `cov([x,y])(1:nx, nx+1:end)`, where nx = columns(x).
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54
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55 ### Alphabetical list of new functions added in Octave 9
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56
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57 * `isuniform`
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58 * `tensorprod`
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59
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60 ### Deprecated functions, properties, and operators
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61
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62 The following functions and properties have been deprecated in Octave 9
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63 and will be removed from Octave 11 (or whatever version is the second
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64 major release after 9):
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65
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66 - Functions
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67
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68 Function | Replacement
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69 -----------------------|------------------
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70
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71 - Properties
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72
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73 The following property names are discouraged, but there is no fixed
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74 date for their removal.
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75
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76 Object | Property | Replacement
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77 -----------------|-------------|------------
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78
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79 - Core
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80
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81 * The `idx_vector::bool()` function is obsolete and always returns true.
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82 Any uses can simply be removed from existing code with no loss of function.
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83
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84 * The `all_ok(const Array<octave::idx_vector>&)` function in `Array-util.h`
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85 is obsolete and always returns true. Any uses can simply be removed from
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86 existing code with no loss of function.
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87
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88 * The member variable `octave_base_value::count` is deprecated and will be removed from Octave 11. Replace all instances with the new name `m_count`.
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89
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90 The following features were deprecated in Octave 7 and have been removed
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91 from Octave 9.
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92
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93 - Functions
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94
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95 Function | Replacement
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96 ---------------------------|------------------
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97 disable_diagonal_matrix | optimize_diagonal_matrix
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98 disable_permutation_matrix | optimize_permutation_matrix
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99 disable_range | optimize_range
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100
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101 - Operators
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102
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103 Operator | Replacement
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104 ---------|------------
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105 .+ | +
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106 .+= | +=
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107 .- | -
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108 .-= | -=
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109 ** | ^
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110 **= | ^=
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111 .** | .^
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112 .**= | .^=
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113
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114 - Interpreter
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115
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116 * The use of `'...'` for line continuations *inside* double-quoted
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117 strings has been removed. Use `'\'` for line continuations inside strings
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118 instead.
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119
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120 * The use of `'\'` as a line continuation *outside* of double-quoted
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121 strings has been removed. Use `'...'` for line continuations instead.
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122
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123 * Support for trailing whitespace after a `'\'` line continuation has been
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124 removed. Delete unnecessary trailing whitespace.
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125
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126 - For plot functions, the use of numbers to select line colors in
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127 shorthand formats was an undocumented feature that was removed in Octave 9.
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128
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129 - The environment variable used by `mkoctfile` for linker flags is now
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130 `LDFLAGS` rather than `LFLAGS`. `LFLAGS` was deprecated in Octave 6
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131 and has been removed.
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132
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133 Summary of bugs fixed for version 9.1.0 (yyyy-mm-dd):
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134 ----------------------------------------------------
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135
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136 - Bugfixes to `whos -file`, `urlread`, `mat2cell`, `set`.
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137
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138 - Memory usage reduced for `movfun` by eliminating temporary copies.
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139
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140 - Memory usage reduced when saving to file, preventing OOM and data loss.
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141
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142 - Several race conditions removed in signal handler.
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143
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144 - Performance improvements: avoid unnecessary string construction, use
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145 static casts instead of dynamic casts where possible.
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146
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147 ### Old release news
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148
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149 - [Octave 8.x](etc/NEWS.8)
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150 - [Octave 7.x](etc/NEWS.7)
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151 - [Octave 6.x](etc/NEWS.6)
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152 - [Octave 5.x](etc/NEWS.5)
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153 - [Octave 4.x](etc/NEWS.4)
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154 - [Octave 3.x](etc/NEWS.3)
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155 - [Octave 2.x](etc/NEWS.2)
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156 - [Octave 1.x](etc/NEWS.1)