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curvefitting of complex number

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Supreeth D K 2022-11-3

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回答： Harshit Gupta 2022-11-15

采纳的回答： Harshit Gupta

I get following error when i use Lsqcurvefit

Warning: Imaginary parts of complex X and/or Y arguments ignored.

> In myfun (line 11).

I want both real and imaginary parts

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KSSV 2022-11-3

Run the function seperately for real and imaginary parts.

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Harshit Gupta 2022-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/1842428-curvefitting-of-complex-number#answer_1100198

Hi Supreeth,

As per my understanding, you are getting the following warning:

Warning: Imaginary parts of complex X and/or Y arguments ignored.

And you want both real and imaginary parts to be included in your plot, while using "lsqcurvefit".

Please refer below to resolve your query:

"lsqcurvefit" can solve complex-valued problems directly. Note that bound constraints do not make sense for complex values. For a complex problem with bound constraints, split the variables into real and imaginary parts. See Fit a Model to Complex-Valued Data.
If you want to plot the real part of a vector versus the complex part, pass the vector as a single complex vector to the "plot" function.
If you want to plot the magnitude of the elements, use the “abs” function on the vector before passing it to the “plot” function.
Please refer to the following link for more information on the “abs” function: https://www.mathworks.com/help/matlab/ref/abs.html
Please refer to the following link for more information on the “plot” function: https://www.mathworks.com/help/matlab/ref/plot.html
You can refer to the following MATLAB Answers link for more information about this warning: https://www.mathworks.com/matlabcentral/answers/96197-why-do-i-get-warning-messages-about-imaginary-parts-of-complex-x-and-or-y-arguments-ignored

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