From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>

Date: Mon Dec 30 2013 - 09:35:37 MST

Date: Mon Dec 30 2013 - 09:35:37 MST

The Description section documentation was not correct. It has been changed.

On 12/29/13, 9:53 AM, Richard Liang wrote:

*> Thanks, Dennis
*

*> The document said "It is necessary that the number of data points) be greater than or equal to n(the number of coefficients)."
*

*> As I understand , for example, if I have 3 points, the max number of coefficients can be 3.
*

*> Mathematically, if I have 3 points, I can make an secend order polynomial to fit these points , in which I should have 3 coefficients.
*

*>
*

*> Best
*

*>
*

*>> Date: Sat, 28 Dec 2013 08:26:49 -0700
*

*>> From: shea@ucar.edu
*

*>> To: richardljy@hotmail.co.uk; ncl-talk@ucar.edu
*

*>> Subject: Re: FW: lspoly didn't wok when the number of data points equal to the number of coefficients
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*>>
*

*>> As noted in the documentation:
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*>>
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*>> n
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*>>
*

*>> The number of coefficients desired (i.e., n-1 will be the degree of the
*

*>> 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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*>>
*

*>> In your case with 3 points, the max number of coefficients would be 2
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*>>
*

*>>
*

*>> On 12/28/13, 5:01 AM, Richard Liang wrote:
*

*>>>
*

*>>>
*

*>>> From: richardljy@hotmail.co.uk
*

*>>> To: ncl-talk@ucar.edu
*

*>>> Subject: lspoly didn't wok when the number of data points equal to the number of coefficients
*

*>>> 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
*

*>>> 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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*>>>
*

*>
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*>
*

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Received on Mon Dec 30 09:35:49 2013

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