how to put an array into a matrix
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Hi there!
the function "triu(X,1)" returns the upper trangular part of the matrix X. I now have an array of size 1-by-(0.5*n*(n-1)), exactly the number of elements in the upper triangular. How can I, without using any loop, put this array into a n-by-n matrix so that this matrix is what triu(X,1) returns?
Thanks. Lianovich
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Walter Roberson
2011-4-10
n = floor(sqrt(2*length(V)));
M = zeros(n);
M(logical(triu(ones(n),1))) = V;
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