From: Richard Liang <richardljy_at_nyahnyahspammersnyahnyah>

Date: Tue Dec 31 2013 - 20:18:33 MST

Date: Tue Dec 31 2013 - 20:18:33 MST

Thanks. Dennis. But the problem remain: Mathematically, if I have 3 points, I can make an second order polynomial to fit these points , in which I should have 3 coefficients.

Thanks

*> Date: Mon, 30 Dec 2013 09:35:37 -0700
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*> From: shea@ucar.edu
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*> To: richardljy@hotmail.co.uk; ncl-talk@ucar.edu
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*> Subject: Re: FW: lspoly didn't wok when the number of data points equal to the number of coefficients
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*>
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*> The Description section documentation was not correct. It has been changed.
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*>
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*> On 12/29/13, 9:53 AM, Richard Liang wrote:
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*> > Thanks, Dennis
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*> > The document said "It is necessary that the number of data points) be greater than or equal to n(the number of coefficients)."
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*> > As I understand , for example, if I have 3 points, the max number of coefficients can be 3.
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*> > Mathematically, if I have 3 points, I can make an secend order polynomial to fit these points , in which I should have 3 coefficients.
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*> >
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*> > Best
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*> >
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*> >> Date: Sat, 28 Dec 2013 08:26:49 -0700
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*> >> From: shea@ucar.edu
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*> >> To: richardljy@hotmail.co.uk; ncl-talk@ucar.edu
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*> >> Subject: Re: FW: lspoly didn't wok when the number of data points equal to the number of coefficients
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*> >>
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*> >> As noted in the documentation:
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*> >>
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*> >> n
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*> >>
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*> >> The number of coefficients desired (i.e., n-1 will be the degree of the
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*> >> polynomial). Due to the method used, n should be less than or equal to
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*> >> five.
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*> >>
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*> >> ===
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*> >>
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*> >> In your case with 3 points, the max number of coefficients would be 2
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*> >>
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*> >>
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*> >> On 12/28/13, 5:01 AM, Richard Liang wrote:
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*> >>>
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*> >>>
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*> >>> From: richardljy@hotmail.co.uk
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*> >>> To: ncl-talk@ucar.edu
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*> >>> Subject: lspoly didn't wok when the number of data points equal to the number of coefficients
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*> >>> Date: Sat, 21 Dec 2013 15:45:08 -0500
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>> lspoly didn't wok when the number of data points equal to the number of coefficientsI did the test
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*> >>> x = (/-4.5, -3.2, -1.4/)y = (/ 0.7, 2.3, 3.8/)n = 3 c = lspoly(x,y, 1, n) print(c)c will be(0) 1e+20(1) 1e+20(2) 1e+20
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*> >>>
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*> >>>
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*> >>> But if n=2 c will be(0) 5.268707(1) 0.9896836
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*> >>> I also did the test in the 4 element array, when n=4, it didn't work. only when n is less than the number of data points
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*> >>> Any body help me? thanks
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*> >>>
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*> >>>
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*> >>>
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*> >>>
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*> >>> _______________________________________________
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*> >>> ncl-talk mailing list
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*> >>> List instructions, subscriber options, unsubscribe:
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*> >>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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*> >>>
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*> >
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*> >
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Received on Tue Dec 31 20:18:49 2013

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