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Re: How to use mpfitfun.pro for fitting? [message #93365 is a reply to message #93364]

Mon, 27 June 2016 04:00

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Monday, June 27, 2016 at 6:14:40 AM UTC+1, Meegle_Jade wrote:
> I went through the documentation but I didn't understand it much. Can anyone of you please give me a sample mpfitfun.pro (with the definition of function)?
>
> PS:Infact I am having a set of flux values(measured) for 4 sources at 5 frequency bands. I know the expression of flux and it's a function of 5 parameters.

Hi,
I'm not sure what the problem with the function definition is. In the instructions I found this:
; FUNCTION MYFUNCT, X, P
; ; The independent variable is X
; ; Parameter values are passed in "P"
; YMOD = ... computed model values at X ...
; return, YMOD
; END

And it worked for me. But anyhow, below is an example that works well for me (adapted from something that I use):

function mySineFunction, x, p
return, p[0] + p[1] * sin(x * p[2] /!radeg + p[3])
end

pro doTheFit, angles, xPos
;************* fit x ****************
xSineFit = double(angles)
ySineFit = double(xPos)
yerr = 1
starty = [-800d, 1000d, 1d, -90d]
xResult = mpfitfun('mySineFunction', xSineFit, ySineFit, yerr, startY)
print, xResult
end

I hope this helps.

Cheers,
Helder

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[Message index]

		How to use mpfitfun.pro for fitting? By: Sonu Tabitha on Sun, 26 June 2016 22:14
		Re: How to use mpfitfun.pro for fitting? By: Helder Marchetto on Mon, 27 June 2016 04:00
		Re: How to use mpfitfun.pro for fitting? By: Sonu Tabitha on Mon, 27 June 2016 08:49
		Re: How to use mpfitfun.pro for fitting? By: Sonu Tabitha on Mon, 27 June 2016 08:54
		Re: How to use mpfitfun.pro for fitting? By: Craig Markwardt on Mon, 27 June 2016 14:23
		Re: How to use mpfitfun.pro for fitting? By: Sonu Tabitha on Mon, 27 June 2016 18:57

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