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From: Anand Sivaramakrishnan anand@stsci.edu
Subject: troubles with parity of forward & inverse mDFT transforms...
Date: January 15, 2015 at 2:42:48 PM EST
Hi Joseph & Marshall
I use matrixDFT from WebbPSF as a standalone (to try to unify my code with WebbPSF utilities), and I'm having some trouble with coordinate flips when transforming forwards, then back.
I start with a psf in this example, transform it forwards to visibilities, then I try to transform it backwards as well as forwards - but get a flipped PSF both times. Running "matrixDFT_test.py" in the attached tar file will do these things, and give you two convenient ds9 commands to cut'n'paste to see the results.
This is a bit worrying, as matrixDFT is at the core of many things I do.
I also include matrixDFT.py copied from WebbPSF, with a print statement to show that I'm actually using this file from the *_test.py driver.
Any comments or suggestions would be great! If I should be using a different 'entry point' into the dft (such as SFT) please do let me know.
(I don't see any straightforward way to attach the file attachment to a github issue, but we have it in our inboxes)
The text was updated successfully, but these errors were encountered:
Thursday Jan 15, 2015 at 21:42 GMT
Originally opened as mperrin/webbpsf#35
Begin forwarded message:
(I don't see any straightforward way to attach the file attachment to a github issue, but we have it in our inboxes)
The text was updated successfully, but these errors were encountered: