view toolboxes/FullBNT-1.0.7/KPMtools/ind2subvMinka.m @ 0:e9a9cd732c1e tip

first hg version after svn

function sub = ind2subvMinka(siz,index)
%IND2SUBV   Subscript vector from linear index.
% IND2SUBV(SIZ,IND) returns a vector of the equivalent subscript values 
% corresponding to a single index into an array of size SIZ.
% If IND is a vector, then the result is a matrix, with subscript vectors
% as rows.

% Written by Tom Minka
% (c) Microsoft Corporation. All rights reserved.

n = length(siz);
if n==0, sub = index; return; end % added by KPM 17 Nov 07
cum_size = cumprod(siz(:)');
prev_cum_size = [1 cum_size(1:end-1)];
index = index(:) - 1;
sub = rem(repmat(index,1,n),repmat(cum_size,length(index),1));
sub = floor(sub ./ repmat(prev_cum_size,length(index),1))+1;

% slow way
%for dim = n:-1:1
%  sub(:,dim) = floor(index/cum_size(dim))+1;
%  index = rem(index,cum_size(dim));
%end