Purpose: To form structures having planes of symmetry by reflecting part of the structure in the coordinate planes, and to set flags so that symmetry is utilized in the solution. Card: Cols Parameter ---------------------- 1- 2 GX 3- 5 I1 6-10 I2 11-80 blank Parameters: Integers (I1) - Tag number increment. (12) - This integer is divided into three independent digits, in columns 8, 9, and 10 of the card, which control reflection in the three orthogonal coordinate planes. A one in column 8 causes reflection along the X-axis (reflection in Y, Z plane); a one in column 9 causes reflection along the Y-axis; and a one in column 10 causes reflection along the Z axis. A zero or blank in any of these columns causes the corres- ponding reflection to be skipped. Decimal Numbers The decimal number fields are not used.
No. of Planes Matrix Fill Factor of Symmetry Storage Time Time 0 N^2 N^2 N^3 1 N^2/2 N^2/2 N^3/4 2 N^2/4 N^2/4 N^3/16 3 N^2/8 N^2/8 N^3/64The matrix factor time represents the optimum for a large matrix factored in core. Generally, somewhat longer times will be observed.
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