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accuracy of the function sincos


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  • From: Shu Heng Pau <gpau@MIT.EDU>
  • To: forum@abinit.org
  • Subject: accuracy of the function sincos
  • Date: Tue, 09 May 2006 16:59:05 -0400

Hi,

In the code for the function sincos, under the notes section, it is mentioned
that the algorithm places strong constraints on accuracy. May I know what
would be the error like compared to an exact computation? What order will the
error be?

I have been trying to reproduce the local pseudopotential obtained in ABINIT
in
Matlab. But, so far, I have been getting a maximum error (maximum over the
values on the fft grid) of 1e-3. Apart from the spline interpolation
procedure
(which I have employed Matlab native function), I think I reproduced all the
main steps in ABINIT. Any suggestions will be most welcomed.

Thanks,
George


  • accuracy of the function sincos, Shu Heng Pau, 05/09/2006

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