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+// Scilab ( http://www.scilab.org/ )
+// Copyright (C) INRIA - Serge STEER
+// 
+
+function I=sub2ind(dims,varargin)
+//sub2ind is used to determine the equivalent single index
+//corresponding to a given set of subscript values.
+ 
+//I = sub2ind(dims,i1,i2,..) returns the linear index equivalent to the
+//row,  column, ... subscripts in the arrays i1,i2,..  for an matrix of
+//size dims.
+ 
+//I = sub2ind(dims,Mi) returns the linear index
+//equivalent to the n subscripts in the columns of the matrix Mi for a matrix
+//of size dims.
+ 
+  d=[1;cumprod(matrix(dims(1:$-1),-1,1))]
+  for i=1:size(varargin)
+    if varargin(i)==[] then I=[],return,end
+  end
+
+  if size(varargin)==1 then //subindices are the columns of the argument
+    I=(varargin(1)-1)*d+1
+  else //subindices are given as separated arguments
+    I=1
+    for i=1:size(varargin)
+      I=I+(varargin(i)-1)*d(i)
+    end
+  end
+endfunction