ind2vec.m

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function v=ind2vec(i)
%IND2VEC Convert indices to vectors.
%
%	Syntax
%
%	  vec = ind2vec(ind)
%
%	Description
%
%	  IND2VEC and VEC2IND allow indices to be represented
%	  either by themselves, or as vectors containing a 1 in the
%	  row of the index they represent.
%
%	  IND2VEC(IND) takes one argument,
%	    IND - Row vector of indices.
%	  and returns sparse matrix of vectors, with one 1 in
%	  each column, as indicated by IND.
%
%	Examples
%
%	  Here four indices are defined and converted to vector
%	  representation.
%
%	    ind = [1 3 2 3]
%	    vec = ind2vec(ind)
%
%	See also VEC2IND.

% Mark Beale, 2-15-96.
% Copyright 1992-2000 The MathWorks, Inc.
% $Revision: 1.7 $

vectors = length(i);
v = sparse(i,1:vectors,ones(1,vectors));