I readily admit that having the option of doing the PSDF at an arbitrary
angle would satisfy 95% (okay, maybe 99%) of the requirements and there is
not a strong argument for the remaining 1-5% so the most general case may
not be worth implementing. Restricting it to what are radial lines in the
2D FFT also simplifies the problem of what coordinates to keep and where
to keep it: the abscissa is the 1/length unit and starts at zero. The
only other quantity is the fixed angle which could be recorded in the
curve title as you suggest.
Thanks,
Tim
----------------------------------------------------------
Tim Strand
San Jose Research Center
Hitachi Global Storage Technologies
3403 Yerba Buena Road
San Jose, CA 95135
Ph: 408-717-5556
"David Necas (Yeti)" <[email protected]>
06/15/2009 09:12 AM
Please respond to
Gwyddion use discussion <[email protected]>
To
Gwyddion use discussion <[email protected]>
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Subject
Re: [Gwyddion-users] profles extracted from 2D fft
On Mon, Jun 15, 2009 at 08:41:11AM -0700, [email protected] wrote:
> All of these comments are good and to the point. The PSDF from the
> statistical function tool is useful (thank you for pointing it out) but
as
> Gregor noted, I was (am) also looking for something more general: being
> able to select arbitrary start and end points in the 2D FFT, not
> necessarily starting at the origin and not necessarily being radial.
I wonder what you need this for but I suppose you would have to kill me
if you told me...
Regarding the coordinates in extracted profiles, it is relatively easy
to add an option to the tool. That is, if we can come to a sensible
definition of what should be kept and where. Do you propose to
transform the abscissa values on the profiles? But how? Or attach the
information to the graph curves somewhere? The only available place is
probably the curve title.
Yeti
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