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Re: CURVEFIT for multiple datasets [message #58442]

Fri, 01 February 2008 01:14

Wox
Messages: 184
Registered: August 2006

Senior Member

On Thu, 31 Jan 2008 04:55:11 -0800 (PST), chloesharrocks@gmail.com
wrote:

<snip>

> How can I extend this for the case when I have say 2data sets, ie:
> x=[[indgen(10)], [indgen(10)]]
> y=[[12.0, 11.0, 10.2, 9.4, 8.7, 8.1, 7.5, 6.9, 6.5, 6.1], [11.5, 10.8,
> 10.3, 9.5, 8.6, 7.8, 7.5, 6.4, 6.4, 5.9]
> and I want to plot an exponential curve through all of this data?

Euhm, I must be missing something here, but what's wrong with just
doing it. You are trying to fit 1 curve which fits best to all
datasets right? I.e. 3 parameters and not 3n parameters?

PRO CURVE_FITTING
x=[findgen(10),findgen(10)]
y=[12.0, 11.0, 10.2, 9.4, 8.7, 8.1, 7.5, 6.9, 6.5, 6.1, 11.5, 10.8,$
10.3, 9.5, 8.6, 7.8, 7.5, 6.4, 6.4, 5.9]

weights=1.0/y ;Define a vector of weights
A=[10.0, -0.1, 2.0] ;Provide an initial guess of the function's
parameters

yfit=CURVEFIT(x,y,weights, A, FUNCTION_NAME='gfunct') ;Compute the
parameters
print, 'Function parameters: ', A

plot, x, y, yrange=[5,13], ystyle=1, xrange=[0, 11], xstyle=1, psym=1

ind=sort(x)
oplot, x[ind], yfit[ind], linestyle=1, color=5
END;PRO CURVE_FITTING

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[Message index]

		Re: CURVEFIT for multiple datasets By: Wox on Fri, 01 February 2008 01:14
		Re: CURVEFIT for multiple datasets By: Spon on Thu, 31 January 2008 10:32
		Re: CURVEFIT for multiple datasets By: Paul Van Delst[1] on Thu, 31 January 2008 08:13
		Re: CURVEFIT for multiple datasets By: David Fanning on Thu, 31 January 2008 06:37
		Re: CURVEFIT for multiple datasets By: chloesharrocks on Thu, 31 January 2008 06:28
		Re: CURVEFIT for multiple datasets By: Spon on Thu, 31 January 2008 06:15

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