MATLAB: Fitting N(N-1) points on an NxN matrix

MATLABmatrix

Suppose I have an N(N-1) vector that corresponds to each non-diagonal entry of an NxN matrix. Is there anyway that I can encode that onto my matrix?
i.e. For n=3, given [ 2 3 4 5 6 7 ] we obtain
[0 4 6 ; 2 0 7 ; 3 5 0]?

Best Answer

% Say your given vector is:
X = [ 2 3 4 5 6 7 ];
% Now to make the matrix.
L = (1 + sqrt(1+4*length(X)))/2;
F = double(~eye(L));
F(~eye(L)) = X
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