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%   隨機數學(30250143, 07Fall) 大作業程序
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%   作者： 王  音 2004011448 
%         葛元愷 2004011425 <geyuank@gmail.com>
%
%   All rights reserved. 2008.1

function result = calc_Z(P) %輔助計算鏈接矩陣Z

[m n] = size(P);
Z = ones(m,n);
result = P & Z;
result = result + 1 - 1;    % trick: convert from logical to matrix :)