CG 3 - Center of Gravity - Radius of gyration

PURPOSE

Compute center of gravity and radius of gyration of a 3-D density distribution.

SEE ALSO

CG	[Center of Gravity]
CG 3	[Center of Gravity - Radius of gyration]
CG PH	[Center of Gravity - Phase approximation ||]

USAGE

.OPERATION: CG 3 [x],[y],[z],[rg]

.THREED FILE: 3DQ003
[Enter name of file containing the 3-D density distribution.]

THRESHOLD: 0.53 [Only data above the threshold will be used in computation.]

NOTES

1. The coordinates of the center of gravity, with respect to the center at (NSAM/2 + 1, NROW/2 + 1, NSLICE/2 +1), and the radius of gyration are printed out and put into the first four (optional) registers appearing on the command line.

2. For the definition of the radius of gyration, see International Tables of Crystallography, vol. III, p327.

SUBROUTINES

CENGR3

CALLER

UTIL1