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Re: Fitting a function with multiple independent variables [message #43624 is a reply to message #43617]

Wed, 20 April 2005 01:06

maarten
Messages: 30
Registered: April 2002

Member

Hello,

You can use the built in routine curvefit.
cheers maarten

Sean Davis wrote:
> Hello all,
>
> I am currently trying to fit a function with multiple independent variables.
> I have used IDL's REGRESS routine, which does a multiple linear regression,
> such as fits to something like:
>
> Y = 5 + 3*X1 - 4*X2
>
> But what if I want one of my independent variables to vary non-linearly,
> like
>
> Y = 5 + 3*X1^2 - 4*X2
>
> (I assume this is called non-linear regression?)
>
> I've heard of Craig M.'s fitting library, so I suppose I should look there.
> But for the record, are there any built-in programs in IDL to do this???
>
> Thanks,
> Sean
>

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[Message index]

		Re: Fitting a function with multiple independent variables By: Sean Davis on Wed, 20 April 2005 13:02
		Re: Fitting a function with multiple independent variables By: Craig Markwardt on Wed, 20 April 2005 11:31
		Re: Fitting a function with multiple independent variables By: Sean Davis on Wed, 20 April 2005 09:30
		Re: Fitting a function with multiple independent variables By: maarten on Wed, 20 April 2005 01:06

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