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Re: poly_fit - yband [message #87985 is a reply to message #87976]

Mon, 10 March 2014 07:33

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Saturday, March 8, 2014 7:43:00 AM UTC-5, sid wrote:
> Hello everyone,
>
> I have x 80 integer values and y 80 values.
>
> I did,
>
> p=poly_fit(x,y,7,yband=e,yfit=y1)
>
>
>
> now I need y values at every 0.33 intervals so, now I have x with 238 values with 0.33 resolution earlier case the resolution was 1.
>
> Now for this 238 x values I have found 238 y values using the polynomial coefficients.
>
> But now the problem is how to find the error values, since I have yband = e (80 values). But I need to find the error values for all the 238 values.

If you decide to switch to the MPFIT family of functions, there is a routine MPPROPERR which can propagate errors of parameters to errors your model function. The included documentation describes what needs to be done.

Craig
http://www.physics.wisc.edu/~craigm/idl/fitting.html

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[Message index]

		poly_fit - yband By: gunvicsin11 on Sat, 08 March 2014 04:43
		Re: poly_fit - yband By: Andy Sayer on Mon, 10 March 2014 06:15
		Re: poly_fit - yband By: Russell Ryan on Mon, 10 March 2014 07:20
		Re: poly_fit - yband By: Craig Markwardt on Mon, 10 March 2014 07:33

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