Why does my objective function return complex?

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Snoopy
Snoopy 2022-2-28
评论： Walter Roberson 2022-3-2
I have a likelihood function that I need to minimize. I use fmincon to search for the minimum. Iterations of fmincon sometimes show "Objective function returned complex; trying a new point…" But in my code I do not take square root of any variable. Why am I then getting this error? A second question is whether there is a counterpart of
dbstop if naninf
for "complex" like the
dbstop if complex
command? Or would
dbstop if error
do?

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Matt J
Matt J 2022-2-28
编辑：Matt J 2022-2-28
There is no "dbstop if complex", but you can set a conditional breakpoints in your objective function to detect when theany particular value is complex.Or, insert a keyboard() command.
function fval=myobjective(x)
fval=....
if ~isreal(fval)
keyboard
end
end
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Snoopy
Snoopy 2022-3-2
编辑：Snoopy 2022-3-2
OK. So "Objective function returned complex; trying a new point..." is not an error and MATLAB will not pause when this warning is displayed.
Walter Roberson
Walter Roberson 2022-3-2
suggest you add a conditional breakpoint to trigger if any(imag(VALUE))

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