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Addition:
This happens with CCP4 6.0.1 on an AMD64 machine.
With 5.0.1 on an Alpha everything is fine.....
Jens T Kaiser wrote:
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Hi all,
I encountered a problem calculating anomalous maps with fft (using the
GUI). The script correctly assigns the anomalous difference to DANO, but
the map I get is the inverse (peaks at negative values). When I subtract
90deg from the phases and force DANO to be type "F" and calculate a
"normal" fft, I get the correct map. FFT being a seasoned program, I
find it hard to believe that this is a bug... A (admittedly not very
thorough) glance through the source indicates that PI/2 is correctly
subtracted from the phase (not added, which would result in the observed
phenomenon). The "phenomenon" of maps calculated by inputting DANO/PHI
vs. DANO->F/PHI-90 being the inverse of each other is reproducible with
other datasets. Am I doing something wrong here or did I indeed stumble
over a "feature"?
Cheers,
Jens
