Re: [bug #22008] Interpolation with relax.plot_disp_curves, creates un-even number of CPMG blocks. -- May 04, 2014 - 11:25

Hi Edward.

The number of CPMG blocks has to be an even number.

I remember this clearly, since I once did an CPMG experiment, with
some ncycs equal 4, 10, 15, 20, 25, ...

And the intensities for all eksperiments with odd NCYC number was horrible.

Kaare told me, that ncycs always has to be even.
That was something that Mikael Akke also have insisted on.

But that day, I could not easily find it in the literature, so I left
it and accepted just another fact of NMR.

And when I did the interpolated graphs with an odd-number of NCYC,
that looked weirdo.
Sig-saw all over the place.

I actually think it could be a input check in relax, warning the user
if the number of CPMG blocks are not equal?

And, I would be very happy to find it in the literature. :-)
Have you ever come around this?

Best
Troels









2014-05-04 11:06 GMT+02:00 Edward d  Auvergne
<NO-REPLY.INVALID-ADDRESS@xxxxxxx>:
> Follow-up Comment #2, bug #22008 (project relax):
>
> If this is a restriction of only the B14 analytic CPMG model
> (http://wiki.nmr-relax.com/B14), it would be best if only the B14 is 
> affected.
>  There is no need to restrict the numeric models based on the artificial
> limitation of an unrelated model.  Maybe the best solution would be to check
> if the model is B14, and if so skip odd interpolation points?
>
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