?? setdiag.m
字號:
function M = setdiag(M, v)
% SETDIAG Set the diagonal of a matrix to a specified scalar/vector.
% M = set_diag(M, v)
n = length(M);
if length(v)==1
v = repmat(v, 1, n);
end
% e.g., for 3x3 matrix, elements are numbered
% 1 4 7
% 2 5 8
% 3 6 9
% so diagnoal = [1 5 9]
J = 1:n+1:n^2;
M(J) = v;
%M = triu(M,1) + tril(M,-1) + diag(v);
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