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User defined NLF complex function using cosh()

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jp.medina11

France
1 Posts

Posted - 09/07/2024 : 7:21:57 PM

Hi,

I am trying to compile a user defined complex function using cosh() in the code builder tab at the NLF fitting Fuction Organizer of OriginPro 2022b. However, I get the error message "Error, cannot convert argument(1) in function call". For some reason when I use the function cos(), it compiles all. But I need the hyperbolic instead. Moreover, if I try to use the function ImCosh(), it is not recognized and the displayed error message is: "Error, function or variable ImCosh not found". The code is here below, if someone can help me I am very grateful!

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void _nlsfIMPS_Complex(
// Fit Parameter(s):
double tau, double alpha,
// Independent Variable(s):
double omega,
// Dependent Variable(s):
double& y1, double& y2)

complex cc = cosh(1+1i*tau*alpha*omega);
y1 = cc.m_re;
y2 = cc.m_im;

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Thanks!!

Juan Medina

YimingChen

1594 Posts

Posted - 09/09/2024 : 09:04:37 AM

The cosh() function does not accept the complex number as the argument.
https://www.originlab.com/doc/OriginC/ref/cosh

The workaround is to use cos() function since cosh(x) = cos(ix).


complex cc = cos(1i*(1+1i*tau*alpha*omega));
y1 = cc.m_re;
y2 = cc.m_im;

James

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