?? invperm.m
字號:
function inva = invperm(a)
%INVPERM Inverse permutation.
% inva = invperm(a)
% a = permutation vector of the integers 1 to length(a)
%
% See also RANDPERM
% Copyright (c) 1994-2006 by Michael G. Kay
% Matlog Version 9 13-Jan-2006 (http://www.ie.ncsu.edu/kay/matlog)
% Input Error Checking ****************************************************
if any(sort(a(:)') ~= 1:length(a(:)))
error('Input argument not a permutation vector.')
end
% End (Input Error Checking) **********************************************
inva(a) = 1:length(a);
inva = reshape(inva,size(a));
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