File: ind2sub.sci

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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA - Serge STEER
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution.  The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt

function varargout=ind2sub(dims,I)
//  ind2sub is used to determine the equivalent subscript values
//   corresponding to a given single index into an array.
//
//   [i1,i2,..] = ind2sub(dims,I) returns the arrays i1, i2, ... containing the
//   equivalent row, column, ... subscripts corresponding to the index
//   matrix I for a matrix of size dims.
//
//   Mi=ind2sub(dims,I) returns a matrix Mi whose columns are the arrays i1(:), i2(:), ... 

  varargout=list()
  d=cumprod(double(dims))
  k1=I
  k=[];k1=k1-1;
  for i=size(d,'*')-1:-1:1
    q=floor(k1/d(i));
    k1=k1-q*d(i);
    varargout(0)=q+1
  end
  varargout(0)=k1+1
  if argn(1)==1 then //return a matrix whose columns are the subindices
    K=[]
    for k=varargout
      K=[K matrix(k,-1,1)]
    end
    varargout=list(K)
  end
endfunction