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Add accumdim function to documentation.c
author Rik <octave@nomad.inbox5.com>
date Sat, 29 Jan 2011 21:58:40 -0800
parents b0084095098e
children cefd568ea073 8d5f0b41e6b0
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1 ## Copyright (C) 2007-2011 David Bateman
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2 ## Copyright (C) 2009-2010 VZLU Prague
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} accumarray (@var{subs}, @var{vals}, @var{sz}, @var{func}, @var{fillval}, @var{issparse})
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22 ## @deftypefnx {Function File} {} accumarray (@var{csubs}, @var{vals}, @dots{})
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23 ##
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24 ## Create an array by accumulating the elements of a vector into the
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25 ## positions defined by their subscripts. The subscripts are defined by
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26 ## the rows of the matrix @var{subs} and the values by @var{vals}. Each row
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27 ## of @var{subs} corresponds to one of the values in @var{vals}.
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28 ##
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29 ## The size of the matrix will be determined by the subscripts themselves.
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30 ## However, if @var{sz} is defined it determines the matrix size. The length
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31 ## of @var{sz} must correspond to the number of columns in @var{subs}.
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32 ##
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33 ## The default action of @code{accumarray} is to sum the elements with the
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34 ## same subscripts. This behavior can be modified by defining the @var{func}
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35 ## function. This should be a function or function handle that accepts a
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36 ## column vector and returns a scalar. The result of the function should not
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37 ## depend on the order of the subscripts.
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38 ##
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39 ## The elements of the returned array that have no subscripts associated with
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40 ## them are set to zero. Defining @var{fillval} to some other value allows
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41 ## these values to be defined.
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42 ##
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43 ## By default @code{accumarray} returns a full matrix. If @var{issparse} is
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44 ## logically true, then a sparse matrix is returned instead.
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45 ##
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46 ## An example of the use of @code{accumarray} is:
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47 ##
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48 ## @example
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49 ## @group
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50 ## accumarray ([1,1,1;2,1,2;2,3,2;2,1,2;2,3,2], 101:105)
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51 ## @result{} ans(:,:,1) = [101, 0, 0; 0, 0, 0]
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52 ## ans(:,:,2) = [0, 0, 0; 206, 0, 208]
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53 ## @end group
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54 ## @end example
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55 ##
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56 ## The complexity in the non-sparse case is generally O(M+N), where N is the
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57 ## number of
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58 ## subscripts and M is the maximum subscript (linearized in multi-dimensional
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59 ## case).
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60 ## If @var{func} is one of @code{@@sum} (default), @code{@@max}, @code{@@min}
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61 ## or @code{@@(x) @{x@}}, an optimized code path is used.
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62 ## Note that for general reduction function the interpreter overhead can play a
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63 ## major part and it may be more efficient to do multiple accumarray calls and
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64 ## compute the results in a vectorized manner.
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65 ## @seealso{accumdim}
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66 ## @end deftypefn
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67
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68 function A = accumarray (subs, vals, sz = [], func = [], fillval = [], issparse = [])
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69
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70 if (nargin < 2 || nargin > 6)
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71 print_usage ();
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72 endif
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73
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74 if (iscell (subs))
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75 subs = cellfun (@vec, subs, "uniformoutput", false);
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76 ndims = numel (subs);
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77 if (ndims == 1)
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78 subs = subs{1};
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79 endif
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80 else
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81 ndims = columns (subs);
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82 endif
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83
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84 if (isempty (fillval))
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85 fillval = 0;
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86 endif
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87
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88 if (isempty (issparse))
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89 issparse = false;
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90 endif
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91
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92 if (issparse)
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93
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94 ## Sparse case. Avoid linearizing the subscripts, because it could overflow.
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95
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96 if (fillval != 0)
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97 error ("accumarray: FILLVAL must be zero in the sparse case");
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98 endif
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99
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100 ## Ensure subscripts are a two-column matrix.
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101 if (iscell (subs))
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102 subs = [subs{:}];
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103 endif
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104
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105 ## Validate dimensions.
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106 if (ndims == 1)
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107 subs(:,2) = 1;
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108 elseif (ndims != 2)
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109 error ("accumarray: in the sparse case, needs 1 or 2 subscripts");
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110 endif
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111
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112 if (isnumeric (vals) || islogical (vals))
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113 vals = double (vals);
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114 else
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115 error ("accumarray: in the sparse case, values must be numeric or logical");
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116 endif
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117
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118 if (! (isempty (func) || func == @sum))
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119
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120 ## Reduce values. This is not needed if we're about to sum them, because
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121 ## "sparse" can do that.
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122
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123 ## Sort indices.
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124 [subs, idx] = sortrows (subs);
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125 n = rows (subs);
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126 ## Identify runs.
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127 jdx = find (any (diff (subs, 1, 1), 2));
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128 jdx = [jdx; n];
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129
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130 vals = cellfun (func, mat2cell (vals(:)(idx), diff ([0; jdx])));
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131 subs = subs(jdx, :);
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132 mode = "unique";
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133 else
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134 mode = "sum";
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135 endif
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136
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137 ## Form the sparse matrix.
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138 if (isempty (sz))
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139 A = sparse (subs(:,1), subs(:,2), vals, mode);
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140 elseif (length (sz) == 2)
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141 A = sparse (subs(:,1), subs(:,2), vals, sz(1), sz(2), mode);
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142 else
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143 error ("accumarray: dimensions mismatch");
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144 endif
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145
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146 else
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147
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148 ## Linearize subscripts.
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149 if (ndims > 1)
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150 if (isempty (sz))
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151 if (iscell (subs))
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152 sz = cellfun (@max, subs);
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153 else
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diff changeset
154 sz = max (subs, [], 1);
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155 endif
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156 elseif (ndims != length (sz))
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157 error ("accumarray: dimensions mismatch");
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158 endif
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159
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160 ## Convert multidimensional subscripts.
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161 if (ismatrix (subs))
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162 subs = num2cell (subs, 1);
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163 endif
10274
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diff changeset
164 subs = sub2ind (sz, subs{:}); # creates index cache
10271
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165 elseif (! isempty (sz) && length (sz) < 2)
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166 error ("accumarray: needs at least 2 dimensions");
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diff changeset
167 elseif (! isindex (subs)) # creates index cache
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168 error ("accumarray: indices must be positive integers");
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169 endif
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170
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171
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172 ## Some built-in reductions handled efficiently.
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diff changeset
173
10268
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174 if (isempty (func) || func == @sum)
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175 ## Fast summation.
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176 if (isempty (sz))
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177 A = __accumarray_sum__ (subs, vals);
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178 else
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179 A = __accumarray_sum__ (subs, vals, prod (sz));
8934
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180 ## set proper shape.
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181 A = reshape (A, sz);
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182 endif
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183
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184 ## we fill in nonzero fill value.
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185 if (fillval != 0)
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186 mask = true (size (A));
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187 mask(subs) = false;
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188 A(mask) = fillval;
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189 endif
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190 elseif (func == @max)
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191 ## Fast maximization.
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192
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193 if (isinteger (vals))
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194 zero = intmin (class (vals));
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195 elseif (islogical (vals))
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196 zero = false;
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197 elseif (fillval == 0 && all (vals(:) >= 0))
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198 ## This is a common case - fillval is zero, all numbers nonegative.
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199 zero = 0;
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200 else
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201 zero = NaN; # Neutral value.
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202 endif
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203
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204 if (isempty (sz))
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205 A = __accumarray_max__ (subs, vals, zero);
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206 else
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207 A = __accumarray_max__ (subs, vals, zero, prod (sz));
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208 A = reshape (A, sz);
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209 endif
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210
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211 if (fillval != zero && ! (isnan (fillval) || isnan (zero)))
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212 mask = true (size (A));
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213 mask(subs) = false;
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214 A(mask) = fillval;
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215 endif
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216 elseif (func == @min)
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217 ## Fast minimization.
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218
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219 if (isinteger (vals))
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220 zero = intmax (class (vals));
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221 elseif (islogical (vals))
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222 zero = true;
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223 else
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224 zero = NaN; # Neutral value.
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225 endif
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226
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227 if (isempty (sz))
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228 A = __accumarray_min__ (subs, vals, zero);
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229 else
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230 A = __accumarray_min__ (subs, vals, zero, prod (sz));
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231 A = reshape (A, sz);
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232 endif
8820
89b95972e178 fix previously introduced problem in octave_sort, improve design
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diff changeset
233
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234 if (fillval != zero && ! (isnan (fillval) || isnan (zero)))
10268
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235 mask = true (size (A));
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236 mask(subs) = false;
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237 A(mask) = fillval;
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238 endif
9a16a61ed43d new optimizations for accumarray
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239 else
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diff changeset
240
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c792872f8942 all script files: untabify and strip trailing whitespace
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241 ## The general case. Reduce values.
10268
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242 n = rows (subs);
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243 if (numel (vals) == 1)
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244 vals = vals(ones (1, n), 1);
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245 else
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246 vals = vals(:);
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247 endif
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parents: 11523
diff changeset
248
10268
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249 ## Sort indices.
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250 [subs, idx] = sort (subs);
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diff changeset
251 ## Identify runs.
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diff changeset
252 jdx = find (subs(1:n-1) != subs(2:n));
10268
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diff changeset
253 jdx = [jdx; n];
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diff changeset
254 vals = mat2cell (vals(idx), diff ([0; jdx]));
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diff changeset
255 ## Optimize the case when function is @(x) {x}, i.e. we just want to
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diff changeset
256 ## collect the values to cells.
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diff changeset
257 persistent simple_cell_str = func2str (@(x) {x});
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diff changeset
258 if (! strcmp (func2str (func), simple_cell_str))
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diff changeset
259 vals = cellfun (func, vals);
10268
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260 endif
9a16a61ed43d new optimizations for accumarray
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diff changeset
261 subs = subs(jdx);
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diff changeset
262
9a16a61ed43d new optimizations for accumarray
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diff changeset
263 ## Construct matrix of fillvals.
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diff changeset
264 if (iscell (vals))
10268
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diff changeset
265 A = cell (sz);
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diff changeset
266 elseif (fillval == 0)
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diff changeset
267 A = zeros (sz, class (vals));
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268 else
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diff changeset
269 A = repmat (fillval, sz);
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diff changeset
270 endif
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diff changeset
271
9a16a61ed43d new optimizations for accumarray
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diff changeset
272 ## Set the reduced values.
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diff changeset
273 A(subs) = vals;
6770
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
diff changeset
274 endif
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
diff changeset
275 endif
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
diff changeset
276 endfunction
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
diff changeset
277
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
diff changeset
278 %!error (accumarray (1:5))
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
diff changeset
279 %!error (accumarray ([1,2,3],1:2))
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
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diff changeset
280 %!assert (accumarray ([1;2;4;2;4],101:105), [101;206;0;208])
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
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diff changeset
281 %!assert (accumarray ([1,1,1;2,1,2;2,3,2;2,1,2;2,3,2],101:105),cat(3, [101,0,0;0,0,0],[0,0,0;206,0,208]))
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
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parents:
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282 %!assert (accumarray ([1,1,1;2,1,2;2,3,2;2,1,2;2,3,2],101:105,[],@(x)sin(sum(x))),sin(cat(3, [101,0,0;0,0,0],[0,0,0;206,0,208])))
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
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283 %!assert (accumarray ({[1 3 3 2 3 1 2 2 3 3 1 2],[3 4 2 1 4 3 4 2 2 4 3 4],[1 1 2 2 1 1 2 1 1 1 2 2]},101:112),cat(3,[0,0,207,0;0,108,0,0;0,109,0,317],[0,0,111,0;104,0,0,219;0,103,0,0]))
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
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284 %!assert (accumarray ([1,1;2,1;2,3;2,1;2,3],101:105,[2,4],@max,NaN),[101,NaN,NaN,NaN;104,NaN,105,NaN])
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
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285 %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],101:105,[2 4],@prod,0,true),sparse([1,2,2],[1,1,3],[101,10608,10815],2,4))
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
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286 %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],1,[2,4]), [1,0,0,0;2,0,2,0])
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
parents:
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287 %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],101:105,[2,4],@(x)length(x)>1),[false,false,false,false;true,false,true,false])
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
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288 %!test
babcbcc11ab6 [project @ 2007-07-06 08:44:04 by dbateman]
dbateman
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289 %! A = accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],101:105,[2,4],@(x){x});
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290 %! assert (A{2},[102;104])
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parents: 9859
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291 %!test
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parents: 9859
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292 %! subs = ceil (rand (2000, 3)*10);
11469
c776f063fefe Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents: 11191
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293 %! vals = rand (2000, 1);
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Rik <octave@nomad.inbox5.com>
parents: 11191
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294 %! assert (accumarray (subs, vals, [], @max), accumarray (subs, vals, [], @(x) max (x)));
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295 %!test
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Jaroslav Hajek <highegg@gmail.com>
parents: 9859
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296 %! subs = ceil (rand (2000, 1)*100);
11469
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Rik <octave@nomad.inbox5.com>
parents: 11191
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297 %! vals = rand (2000, 1);
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Rik <octave@nomad.inbox5.com>
parents: 11191
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298 %! assert (accumarray (subs, vals, [100, 1], @min, NaN), accumarray (subs, vals, [100, 1], @(x) min (x), NaN));
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299 %!test
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Jaroslav Hajek <highegg@gmail.com>
parents: 9859
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300 %! subs = ceil (rand (2000, 2)*30);
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parents: 9859
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301 %! subsc = num2cell (subs, 1);
11469
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Rik <octave@nomad.inbox5.com>
parents: 11191
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302 %! vals = rand (2000, 1);
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Rik <octave@nomad.inbox5.com>
parents: 11191
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303 %! assert (accumarray (subsc, vals, [], [], 0, true), accumarray (subs, vals, [], [], 0, true));
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304 %!test
9a16a61ed43d new optimizations for accumarray
Jaroslav Hajek <highegg@gmail.com>
parents: 9859
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305 %! subs = ceil (rand (2000, 3)*10);
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Jaroslav Hajek <highegg@gmail.com>
parents: 9859
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306 %! subsc = num2cell (subs, 1);
11469
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Rik <octave@nomad.inbox5.com>
parents: 11191
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307 %! vals = rand (2000, 1);
c776f063fefe Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents: 11191
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308 %! assert (accumarray (subsc, vals, [], @max), accumarray (subs, vals, [], @max));
10268
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Jaroslav Hajek <highegg@gmail.com>
parents: 9859
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309
9a16a61ed43d new optimizations for accumarray
Jaroslav Hajek <highegg@gmail.com>
parents: 9859
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310