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* NEWS-5.1.md: Enable ToC display inside a div-block element.
author Kai T. Ohlhus <k.ohlhus@gmail.com>
date Mon, 04 Mar 2019 11:24:41 +0100
parents 0b3d9f76c7cd
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ---
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2 layout: page
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3 title: Summary of important user-visible changes for version 5
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4 menu: false
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5 ---
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7 February 23, 2019
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9 {::options parse_block_html="true" /}
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10 <div class="panel callout">
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11 * TOC
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12 {:toc}
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13 </div>
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14 {::options parse_block_html="false" /}
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16 ### General improvements
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18 - The Octave plotting system now supports high resolution screens,
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19 i.e., those with greater than 96 DPI which are referred to as
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20 HiDPI/Retina monitors.
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22 - Unicode character support for files and folders in Windows.
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24 - A new core function `movfun` will apply a function to a sliding
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25 window of arbitrary size on a dataset and accumulate the results.
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26 Many common cases have been implemented using the naming
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27 scheme `movXXX` where `XXX` is the function that will be applied.
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28 For example, the moving average over a dataset is `movmean`.
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29 New moving window functions:
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30
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31 `movfun` `movslice`
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32 `movmad` `movmax` `movmean` `movmedian` `movmin` `movprod`
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33 `movstd` `movsum` `movvar`
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35 - The `fsolve` function has been tweaked to use larger step sizes when
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36 calculating the Jacobian of a function with finite differences.
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37 This leads to faster convergence.
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39 - The `ranks` function has been recoded for performance and is now 25X
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40 faster. In addition, it now supports a third argument that specifies
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41 how to resolve the ranking of tie values.
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43 - The function `randi` has been recoded to produce an unbiased (all
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44 results are equally likely) sample of integers. This may produce
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45 different results in existing code. If it is necessary to reproduce
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46 the exact random integer sequence as in previous versions use
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48 `ri = imin + floor ((imax - imin + 1) * rand ());`
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50 - The function `isdefinite` now returns `true` or `false` rather than
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51 `-1`, `0`, or `1`. To test for a positive semi-definite matrix (old
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52 output of `0`) check whether the following two conditions hold:
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53
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54 `isdefinite (A) => 0` and `isdefinite (A + 5*TOL, TOL) => 1`
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56 - The `intmax`, `intmin`, and `flintmax` functions now accept a variable
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57 as input. Existing code to query the range of an existing variable can
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58 be simplified by removing the call to `class` that was previously
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59 required. For example defining the variable `x = int8 (3)` in the
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60 workspace, calls like
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62 `range = [ intmin(class(x)), intmax(class(x)) ]`
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64 can in Octave 5 be simplified to `range = [ intmin(x), intmax(x) ]`.
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66 - The path handling functions no longer perform variable or brace
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67 expansion on path elements and Octave's load-path is no longer
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68 subject to these expansions.
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70 - A new printing device is available, `"-ddumb"`, which produces ASCII
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71 art for plots. This device is only available with the gnuplot toolkit.
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74 ### Dependencies
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76 - The GUI requires Qt libraries. The minimum Qt4 version supported is
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77 Qt4.8. Qt5 of any version is preferred.
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79 - The OSMesa library is no longer used. To print invisible figures
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80 when using OpenGL graphics, the Qt `QOFFSCREENSURFACE` feature must be
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81 available and you must use the qt graphics toolkit.
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83 - The FFTW library is now required to perform FFT calculations.
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84 The FFTPACK sources have been removed from Octave.
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86
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87 ### Matlab compatibility
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89 - The determination of an object's dimensions, size, and shape by the
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90 functions `ndims`, `rows`, `columns`, `isscalar`, `isvector`,
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91 `isrow`, `iscolumn`, `ismatrix`, and `issquare` now fully depends
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92 on the function size. Thus, any user-defined object can ensure correct
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93 treatment by the aforementioned functions by properly overloading the
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94 `size` function.
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96 - The functions `issymmetric` and `ishermitian` accept an option
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97 `"nonskew"` or `"skew"` to calculate the symmetric or skew-symmetric
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98 property of a matrix. Performance has also been increased.
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100 - The `issorted` function now uses a direction option of `"ascend"`
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101 or `"descend"`. Change all uses of `"ascending"` and `"descending"`
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102 in existing code to the new options.
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103
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104 - The `strncmp` and `strncmpi` functions now return `true` if the two
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105 input strings match, even though the number of characters specified
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106 by `n` exceeds the string length. For Example:
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108 `strncmp ("abc", "abc", 100)`
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109
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110 returns `true` in Octave 5 and `false` in older versions of Octave.
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111
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112 - The `str2func` function no longer accepts a second `"global"` argument.
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113 This argument was typically used to allow functions that accept
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114 function names as arguments to avoid conflicts with subfunctions or
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115 nested functions. Instead, it's best to avoid this situation
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116 entirely and require users to pass function handles rather than
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117 function names.
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119 - Using `clear` with no arguments now removes only local variables
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120 from the current workspace. Global variables will no longer be
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121 visible, but they continue to exist in the global workspace and
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122 possibly other workspaces such as the base workspace.
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124
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125 #### Nonlinear Equations
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126
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127 Several default solver options have been changed to be Matlab compatible.
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128 This *may* result in existing code producing different results.
166
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129
169
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130 - `fsolve`
166
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131
169
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132 Option | New Default | Old Default
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133 ---------------|------------------|-------------
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134 `FinDiffType` | `"forward"` | `"central"`
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135 `MaxFunEvals` | `100*length(x0)` | `Inf`
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136 `TolFun` | `1e-6` | `1e-7`
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137 `TolX` | `1e-6` | `1e-7`
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138 `Updating` | `"off"` | `"on"`
166
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139
169
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140 - `fminsearch`
166
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141
169
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142 Option | New Default | Old Default
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143 ---------|-------------|------------
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144 `TolFun` | `1e-7` | `1e-4`
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145
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146 - `fminbnd`
166
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147
169
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148 Option | New Default | Old Default
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149 ---------------|-------------|------------
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150 `MaxFunEvals` | `500` | `Inf`
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151 `MaxIter` | `500` | `Inf`
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152 `TolX` | `1e-4` | `1e-8`
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153
169
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154 - `fminunc`
166
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155
169
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156 Option | New Default | Old Default
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157 ---------------|------------------|------------
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158 `FinDiffType` | `"forward"` | `"central"`
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159 `MaxFunEvals` | `100*length(x0)` | `Inf`
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160 `TolX` | `1e-6` | `1e-7`
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161 `TolFun` | `1e-6` | `1e-7`
166
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162
169
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163
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164 #### Graphic objects
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165
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166 - Figure graphic objects have a new property `"Number"` which is
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167 read-only and will return the handle (number) of the figure.
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168 However, if the property `"IntegerHandle"` has been set to `"off"`
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169 then the property will return an empty matrix `[]`.
166
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170
169
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171 - Patch and surface graphic objects now use the `"FaceNormals"` property
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172 for flat lighting.
166
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173
169
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174 - `"FaceNormals"` and `"VertexNormals"` for patch and surface graphic
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175 objects are now calculated only when necessary to improve graphics
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176 performance. In order for any normals to be calculated the
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177 `"FaceLighting"` property must be set to `"flat"` (FaceNormals) or
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178 `"gouraud"` (VertexNormals), **and** a light object must be present
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179 in the axes.
166
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180
169
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181 - The `"Margin"` property of `text`-objects has a new default of `3`
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182 rather than `2`.
166
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183
169
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184 - Printing to raster formats (bitmaps like PNG or JPEG) now uses an
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185 OpenGL-based method by default. The print options `"-opengl"`
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186 (raster) and `"-painters"` (vector) have been added ("qt" toolkit
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187 only). The figure property `"renderer"` specifies which renderer to
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188 use. When the property `"renderermode"` is `"auto"` Octave will select
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189 `"-opengl"` for a raster output format and `"-painters"` for a vector
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190 output format.
166
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191
169
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192 - A new print option `"-RGBImage"` has been added which captures the
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193 pixels of a figure as an image. This is similar to screen capture
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194 tools, except that print formatting options can be used to, for
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195 example, change the resolution or display the image in black and
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196 white.
166
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197
169
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198 - Two new print options for page-based formats (PDF, PostScript) have
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199 been added. The `"-fillpage"` option will stretch the plot to occupy
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200 the entire page with 0.25 inch margins all around. The `"-bestfit"`
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201 option will expand the plot to take up as much room as possible on
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202 the page without distorting the original aspect ratio of the plot.
166
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203
169
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204 - Printing using the `"-dtiff"` output device will now create compressed
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205 images using LZW compression. To produce uncompressed images use the
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206 `"-dtiffn"` device.
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207
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208
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209 ### Legacy functions
166
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210
169
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211 The following functions have been declared legacy functions which
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212 means they are obsolete and should not be used in any new code.
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213 Unlike deprecated functions, however, their removal from Octave has
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214 not yet been scheduled.
166
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215
169
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216 Function | Replacement
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217 -----------------------|------------------
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218 `findstr` | `strfind`
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219 `flipdim` | `flip`
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220 `isdir` | `isfolder` or `dir_in_loadpath`
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221 `isequalwithequalnans` | `isequaln`
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222 `isstr` | `ischar`
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223 `setstr` | `char`
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224 `strmatch` | `strncmp` or `strcmp`
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225 `strread` | `textscan`
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226 `textread` | `textscan`
166
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227
169
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228
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229 ### Deprecated functions and properties
166
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230
169
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231 The following functions and graphics properties have been deprecated
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232 in Octave 5 and will be removed from Octave 7 (or whatever version
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233 is the second major release after 5):
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234
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235 - Functions
166
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236
169
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237 Function | Replacement
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238 -------------------------|-------------------
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239 `output_max_field_width` | `output_precision`
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240 `is_keyword` | `iskeyword`
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241
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242 - Graphics properties
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243
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244 Object | Property | Value
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245 -----------------|---------------|------------
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246 `text` | `fontangle` | `"oblique"`
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247 `uibuttongroup` | `fontangle` | `"oblique"`
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248 `uicontrol` | `fontangle` | `"oblique"`
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249 `uipanel` | `fontangle` | `"oblique"`
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250 `uitable` | `fontangle` | `"oblique"`
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251
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252 - Specifying `legend` position with a numeric argument is deprecated.
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253 Use a string argument instead.
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254
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255 - The environment variable used by `mkoctfile` for linker flags is now
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256 `LDFLAGS` rather than `LFLAGS`. `LFLAGS` is deprecated, and a warning
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257 is emitted if is used, but it will continue to work.
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258
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259
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260 ### Removed functions and properties
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261
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262 The following functions and properties were deprecated in Octave 4.2
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263 and have been removed from Octave 5.
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264
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265 - Functions
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266
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267 Function | Replacement
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268 -----------------------|------------------
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269 `bitmax` | `flintmax`
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270 `mahalanobis` | `mahal` in Octave Forge statistics pkg
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271 `md5sum` | `hash`
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272 `octave_config_info` | `__octave_config_info__`
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273 `onenormest` | `normest1`
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274 `sleep` | `pause`
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275 `usleep` | `pause`
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276 `wavread` | `audioread`
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277 `wavwrite` | `audiowrite`
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278
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279 - Properties
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280
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281 Object | Property | Value
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282 ------------|-------------------|---------
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283 `axes` | `xaxislocation` | `"zero"`
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284 | `yaxislocation` | `"zero"`
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285 `hggroup` | `erasemode` |
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286 `image` | `erasemode` |
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287 `line` | `erasemode` |
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288 `patch` | `erasemode` |
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289 `patch` | `normalmode` |
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290 `surface` | `erasemode` |
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291 `surface` | `normalmode` |
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292 `text` | `erasemode` |
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293
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294
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295 ### Alphabetical list of new functions added in 5
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296
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297 - `clearvars`
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298 - `isfile`
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299 - `isfolder`
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300 - `matlab.lang.makeUniqueStrings`
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301 - `matlab.lang.makeValidName`
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302 - `movegui`
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303 - `movfun`
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304 - `movie`
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305 - `movmad`
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306 - `movmax`
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307 - `movmean`
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308 - `movmedian`
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309 - `movmin`
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310 - `movprod`
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311 - `movslice`
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312 - `movstd`
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313 - `movsum`
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314 - `movvar`
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315 - `openfig`
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316 - `ordeig`
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317 - `savefig`
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318 - `uitable`
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319
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320
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321 ### Old release news
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322
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323 - [Octave 4.4.x](NEWS-4.4.html)
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324 - [Octave 4.2.x](NEWS-4.2.html)
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325 - [Octave 4.0.x](NEWS-4.0.html)
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326 - [Octave 3.8.x](NEWS-3.8.html)
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327 - [Octave 3.6.x](NEWS-3.6.html)
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328 - [Octave 3.4.x](NEWS-3.4.html)
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329 - [Octave 3.2.x](NEWS-3.2.html)
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330 - [Octave 3.0.x](NEWS-3.html)
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331 - [Octave 2.x](NEWS-2.html)
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332 - [Octave 1.x](NEWS-1.html)