| % POLY_FIT: Warning: Invert detected a small pivot element - help needed [message #71353] |
Sat, 12 June 2010 11:54  |
sid
Messages: 50
Registered: January 1995
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Member |
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Hi,
I am fitting my data with 3 degree polynomial using poly_fit,
after running the program, im getting this warning message % POLY_FIT:
Warning: Invert detected a small pivot element. Please suggest me if
there is any way to get rid of this and why exactly im getting this
kind of warning.
Note: I read from poly_fit help that by setting the /double keyword,
we can get rid of this kind of warning. But that doesn't helped me.
regards
sid
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| Re: % POLY_FIT: Warning: Invert detected a small pivot element - help needed [message #71694 is a reply to message #71353] |
Mon, 12 July 2010 16:41  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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On Jul 11, 6:43 am, landsito <u...@compgroups.net/> wrote:
> Hi, I solved this with my code:
>
> poly_coefs = poly_fit(xvector, yvector, 3,/double,status=estatus)
> if estatus eq 2 then begin
> xvector=[0,xvector]
> yvector=annularSum[xvector]
> poly_coefs = poly_fit(xvector, yvector, 3,/double,status=estatus)
> print, 'estatusss',estatus
> endif
>
> Also, you can add more cases with a case 1: ....
It's not clear to me how adding fake data points will "solve" the
problem...
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| Re: % POLY_FIT: Warning: Invert detected a small pivot element - help needed [message #71710 is a reply to message #71353] |
Sun, 11 July 2010 03:43 |
Giuseppe Papa
Messages: 27
Registered: February 2010
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Junior Member |
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Hi, I solved this with my code:
poly_coefs = poly_fit(xvector, yvector, 3,/double,status=estatus)
if estatus eq 2 then begin
xvector=[0,xvector]
yvector=annularSum[xvector]
poly_coefs = poly_fit(xvector, yvector, 3,/double,status=estatus)
print, 'estatusss',estatus
endif
Also, you can add more cases with a case 1: ....
Best regards.
Luis Navarro D.
luis.navarro.dominguez@gmail.com
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frmsrcurl: http://compgroups.net/comp.lang.idl-pvwave/-POLY_FIT-Warning -Invert-detected-a-small-pivot-element-help-needed
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