comp.lang.idl-pvwave archive: archive » Re: poly

Home » Public Forums » archive » Re: poly_fit for less number of points

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

Re: poly_fit for less number of points [message #84226 is a reply to message #84225]

Sat, 04 May 2013 05:00

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

On Sat, 4 May 2013 03:44:28 -0700 (PDT), sid wrote:

> Hello everyone,
> I have only 6 x values and y values, for example
> my x = [3932.9321,3933.0452,3933.1162,3933.2514,3933.3517,3933.4271 ]
> y = [0.090313701,0.084354165,0.080794218,0.075102273,0.074025219 ,0.082037902]
> I have to fit this with polynomial, I tried svdfit and poly_fit. But are not giving good fit. Please suggest me a way to fit these data points.
>
> thanking you in advance
> sid

You could try the following: Calculate the average xc of the x values.
Then transform the x values to xt=x-xc and do the fitting for the
tranformed values.

Heinz

Report message to a moderator

[Message index]

		Re: poly_fit for less number of points By: Craig Markwardt on Mon, 06 May 2013 13:26
		Re: poly_fit for less number of points By: Heinz Stege on Mon, 06 May 2013 11:02
		Re: poly_fit for less number of points By: Jeremy Bailin on Mon, 06 May 2013 06:48
		Re: poly_fit for less number of points By: David Fanning on Sun, 05 May 2013 15:03
		Re: poly_fit for less number of points By: Craig Markwardt on Sun, 05 May 2013 12:59
		Re: poly_fit for less number of points By: sid on Sat, 04 May 2013 07:02
		Re: poly_fit for less number of points By: Heinz Stege on Sat, 04 May 2013 05:00
		Re: poly_fit for less number of points By: Craig Markwardt on Sun, 05 May 2013 12:55
		Re: poly_fit for less number of points By: Yngvar Larsen on Tue, 07 May 2013 01:20

Previous Topic:	idlwave online help error
Next Topic:	the problem for GPULIB+IDL

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 18:22:27 PDT 2025

Total time taken to generate the page: 0.00175 seconds