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3.7 Eigenvalues and eigenvectors of a D.S. VVPR

Preprocessor VVDSXX changes the type of a D.S. VVPR, i.e. changes from double to single precision.

Preprocessor CODEXX is used to plot the eigenvalues. It constructs, using D.S. VVPR, a file used to employ TRACXX to visualize the eigenvalues.

To plot the eigenvectors, we use preprocessor COBVXX, which constructs a B structure containing one or several vectors using D.S. VVPR. Preprocessor TRMCXX is used to visualize these eigenvectors (in the form of deformations or velocity).