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Re: Fitting curves [message #2884 is a reply to message #2707]

Fri, 02 September 1994 08:57

amaravad
Messages: 11
Registered: September 1994

Junior Member

In article <341uu7$9me@aragorn.unibe.ch> larkum@optolab.unibe.ch writes:
> Hi,
>
> I know this goes around once in a while but I'm really confused about
> how to use the CURVEFIT procedure. I want to fit a double or triple
^^^^^^^^^^^^^^^^^^^^^^
> exponential curve to some data. Inititally, I'll be happy to try
^^^^^^^^^^^^^^^^^^
> out a single exponential fit.
>

pardon my ignorance, but do you mean a sum of 2 or 3 exponentials :
like Y(x) = A*exp(Bx)+C*exp(Dx). If this is what you want to do,
it is fairly straight forward with the CURVEFIT procedure. For better
understanding try reading the Marquartdt algorithm from Bevington.
This book is refered to in the help pages of IDL's CURVEFIT routine.

> I would really like to see an example and copy that. Is there some kind
> soul out there who would has an example from beginning to end for the
> dummies like me?

I will be happy to help you with this problem, but would like to know
what your model function is.

>
> Thanks heaps,
>
> Matthew.
> larkum@optolab.unibe.ch
>

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[Message index]

		Fitting curves By: larkum on Wed, 31 August 1994 06:00
		Re: Fitting curves By: larkum on Tue, 06 September 1994 01:03
		Re: Fitting curves By: agraps on Fri, 02 September 1994 17:52
		Re: Fitting curves By: isaacman on Fri, 02 September 1994 13:08
		Re: Fitting curves By: amaravad on Fri, 02 September 1994 08:57

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