"Warning: Imaginary parts of complex X and/or Y arguments ignored" in fminserach and optimtool
2 次查看(过去 30 天)
显示 更早的评论
Dear all,
I am trying to fit a curve to experimental data by use of "optimtool" and "fminsearch".
But I receive a warning which says " Imaginary parts of complex X and/or Y arguments ignored". I have this warning from the first iteration.
Any idea to solve this warning is appreciated. Thanks in advance Best regards Victor
0 个评论
采纳的回答
Walter Roberson
2012-3-5
If your fitting inherently involves imaginary quantities, then please note:
fminsearch only minimizes over the real numbers, that is, x must only consist of real numbers and f(x) must only return real numbers. When x has complex variables, they must be split into real and imaginary parts.
2 个评论
Walter Roberson
2012-3-5
Beware of log vs log10
See also
http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
更多回答(1 个)
Sean de Wolski
2012-3-5
Evaluate your function at the initial values you provide. Is the result complex? If so, that's the reason for the warning. We can't be of much more assistance without seeing reproduction steps.
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Problem-Based Optimization Setup 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!