comp.lang.idl-pvwave archive: archive » CURVFIT with XY error

Home » Public Forums » archive » CURVFIT with XY error

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: CURVFIT with XY error [message #90199 is a reply to message #88447]

Tue, 10 February 2015 10:33

Russell[1]
Messages: 101
Registered: August 2011

Senior Member

I am only aware of this working for fitting a linear function:

y= m*x + b

But for that, you can use Brandon Kelly's fitexy.pro in astrolib:

http://idlastro.gsfc.nasa.gov/contents.html

http://idlastro.gsfc.nasa.gov/ftp/pro/math/fitexy.pro

Are you sure your function is nonlinear? I mean, is there any transformation you can apply to force it to be linear?

-Russell

On Sunday, April 27, 2014 at 5:31:55 PM UTC-4, Amin Farhang wrote:
> Hi,
>
> Is there any replacing routine for CURVFIT which was able to do a non-linear least squares fit to a user-supplied function by considering both X and Y error?
>
> data sample:
>
> X = [0.8, 2.2, 3.3, 4.8, 5.8]
> Y = [2.02, 2.78, 3.58, 5.05, 6.35]
> Xerr = 0.03*X
> Yerr = 0.05*Y
>
>
> Best regards,

Report message to a moderator

[Message index]

		CURVFIT with XY error By: amin farhang on Sun, 27 April 2014 14:31
		Re: CURVFIT with XY error By: Craig Markwardt on Tue, 29 April 2014 21:01
		Re: CURVFIT with XY error By: wlandsman on Mon, 09 February 2015 11:42
		Re: CURVFIT with XY error By: brubaker.phil on Mon, 09 February 2015 10:05
		Re: CURVFIT with XY error By: Craig Markwardt on Mon, 09 February 2015 10:10
		Re: CURVFIT with XY error By: brubaker.phil on Tue, 10 February 2015 08:42
		Re: CURVFIT with XY error By: dg86 on Tue, 10 February 2015 09:16
		Re: CURVFIT with XY error By: Russell[1] on Tue, 10 February 2015 10:33
		Re: CURVFIT with XY error By: Craig Markwardt on Tue, 10 February 2015 11:11
		Re: CURVFIT with XY error By: brubaker.phil on Fri, 13 February 2015 11:30

Previous Topic:	IDL array subscripting issue
Next Topic:	mpfitfun and complex data

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 16:00:06 PDT 2025

Total time taken to generate the page: 0.00459 seconds