Why do unexpected imaginary values appear when I try to fill my matrix with a loop?
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The entire code is too big to put here, but I have
Ntot = Nq*Nw;
matrix = zeros(Ntot,4);
Nline = 0;
for iq=1:Nq
for iw=1:Nw
Nline = Nline+1;
matrix(Nline,1) = q(iq);
matrix(Nline,2) = iw;
matrix(Nline,3) = pq(iq)/Nw;
matrix(Nline,4) = function(q(iq), w(iw,:), u(iw,:), r(iw,:));
end
end
with q and pq vectors with only real numbers. The function in line 4 is also working. The first loop (of iq, so for several lines) goes as expected, but in the second loop suddenly unwanted and unexpected imaginary numbers appear in ALL the columns. Can anyone help me with this?
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Answers (1)
Matt J
on 5 May 2014
Edited: Matt J
on 5 May 2014
Trap the line that generates complex values by Setting A Conditional Breakpoint. Logical places to do this would be all the lines in the loop that assign to "matrix". The relevant condition would be
nnz(imag(matrix))>0
Do similarly inside whatever "function" is now called until you find the exact line.
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