without using loops

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 i have a large scale of data. i need to do the following job without using loops
  z=[1,2,3,4;5,18,7,8;12,16,35,-8];
  yuk=max(z(:,1:end));

i want to search "yuk" vectors elements in the "z" matrice. but i want to search yuk(1) only for first column of the z matrice , the yuk(2) to the second column of the matrice and so on. how can i do that

thanks

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osman 2011-10-4

x=[2,3,4,5;1,3,2,5;8,7,6,5];

y=[-1,2,3,6;8,6,7,5;10,11,12,18];

z=[1,2,3,4;5,18,7,8;12,16,35,-8];

[yuk,idx]=max(z) %as andrei says (http://www.mathworks.com/matlabcentral/answers/17409-without-using-loops)

here z is a function of x and y and the question is to find which corresponds to the max z in each column in the matrices x and y

in short i need to find elements of matrices in each column using idx without using loops For example in the 1. colum max z is 12 and find x is 8 y is 10