Abstract
The interactive FORTRAN 77 program MATOP is designed to help students and researchers in crystallography calculate the geometrical properties of crystals. The applications of MATOP include calculating lengths and angles involved face poles, zones and bonds, determining normals to planes of atoms and transforming atomic coordinates for viewing a crystal structure down any line or perpendicular to any plane, and determining symmetries. The program assists in the solution of these problems by determining metrical matrices, change of basis matrices, matrix representations of isometrics, inverses of matrices, inner products, and cross products with respect to any given basis. The program can store up to 15 3 x 3 matrices and 12 3-dimensional vectors. The program was written to apply the theory of matrix and vector algebra to these crystallographic problems as discussed in our book Mathematical Crystallography.
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