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matlabmatrixranking

Function programming from a ranking to binary choice matrix

I have some difficulties programming a function in MATLAB. I want to construct a function that converts a given ranking into a binary choice matrix. For example, when 3 options are ranked in a ranking R(3,1,2) the binary choice matrix should be 

[0 1 0;
 0 0 0; 
 1 1 0]

So when element i proceeds element j, the matrix element a(i,j) is 1 and 0 otherwise. Could anyone help me create this function please?

Solution

  • I'm not sure I understand the question, but this seems to do what you want:

    r = [3 1 2]; %// ranking
[~, s] = sort(r);
M = bsxfun(@gt, s, s.');