[cctbxbb] structure_factors_from_map
Ralf W. Grosse-Kunstleve
rwgk at yahoo.com
Mon Jul 9 13:35:45 PDT 2007
Hi Philipp,
The two FFTs introduce a scale factor equivalent to the number of grid points. Please try adding this code:
x = abs(new_array).data()
y = abs(very_new_array).data()
lc = flex.linear_correlation(x, y)
lc.show_summary()
lr = flex.linear_regression(x, y)
lr.show_summary()
The correlation coefficient should be 1.0 exactly, and the linear-regression slope is the same as the "total number of grid points" shown in the output:
total number of grid points: 345600
...
is_well_defined: True
mean_x: 43.9292797741
mean_y: 15181959.0899
coefficient: 1.0
is_well_defined: True
y_intercept: 5.1687812285e-07
slope: 345600.0
Ralf
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