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RD - ReDuce transform

(7/1/85)

PURPOSE

Generates reduced Fourier transform from a masked Fourier file produced by 'GF C'.

SEE ALSO

RD D [Reduce transform -- use reflection files]
RD L [Reduce transform - List only]
GF C [General Filter -- quasi-optical Fourier Filtration]

USAGE

.OPERATION: RD

.MASKED FILE: MSK001
[Enter name of masked file previously written by 'GF C'.]

[For each reflection in the masked file, the computer will combine the maximum amplitude with an average of amplitude weighted phases contained in the window. A list of the new reflections (H,K,AMP,PHASE) will be printed out. An 8x8 matrix contains all reflections.]

.INTERPOLATING FACTOR, REPEATING FACTOR: 2,4
[Enter factor NINTER (factor of two) by which the inversely transformed output matrix has to be interpolated. This is done by using a Fourier matrix that is larger in both directions, by a factor of NINTER, than is needed to contain the reflection orders.

As the second input, enter the factor NREP by which the unit cell has to be repeated in the transformed output matrix. Repeating is done by interspacing the reflections with zeros. For instance, a repeating factor of 4 will produce a transform having three coefficients between successive reflections, and will result in a 4x4 repeated unit cell in the transformed output image.]

.OUTPUT FILE: OUT001
[Enter the name of the file where the (reduced) output Fourier is to be put. The final dimensions of this file are, in both directions:
NDIM * NINTER * NREP (in our example)= 8 * 2 * 4 = 64 ]

SUBROUTINES

REDUCE, REDUC1, PHAORG

CALLER

FOUR1

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