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Re: Voigt funcion in mpfit [message #94818 is a reply to message #94814]

Wed, 25 October 2017 12:28

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Wednesday, October 25, 2017 at 7:15:59 AM UTC-4, abc wrote:
> HI, I have set of data of an absorption spectra and I want to fit the voigt profile using mpfit. The function I am using is http://www.heliodocs.com/php/xdoc_print.php?file=$SSW/yohkoh /ucon/idl/metcalf/voigt.pro
> But I am getting error as
> GDL> res=mpfit('voigt',p0,functargs=fa)
> % VOIGT: function VOIGT takes 2 params: 'Result = VOIGT(A,U)'

First of all, the VOIGT you linked to is a procedure, not a function. MPFIT only works with functions, not procedures. It tries to call VOIGT() as a function, and it gets the system version. Is that what you want?

Second of all, VOIGT has two inputs. How are those meant to be passed? You don't show it in your example.

Third, where is the data? What you showed is just a bare call to VOIGT. Don't you want to compare the VOIGT function results to some data? MPFIT() by itself wants you to compute the residuals. Or, if you don't want to do that, you can use MPFITFUN instead, but you still need data.

Fourth, what are the parameters? Are you trying to solve for A and V?

Craig

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[Message index]

		Voigt funcion in mpfit By: abc on Wed, 25 October 2017 04:15
		Re: Voigt funcion in mpfit By: wlandsman on Wed, 25 October 2017 08:01
		Re: Voigt funcion in mpfit By: Craig Markwardt on Wed, 25 October 2017 12:28

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