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This DS stores information corresponding to the eigenvalues and vectors of a system.
DS VVPR is composed of five arrays of predefined order.
This integer array contains 32 variables, consisting of a general description of the job (title, date, name), of DS VVPR (type, level, ...), and indicates the presence or absence of array VVP1.
the job title in 20 words of 4 characters,
the data of creation in 2 words of 4 characters,
the creator's name in 6 words of 4 characters,
the DS type,
the DS level,
a reserved parameter,
the number of supplementary arrays associated with the DS (they are described in array VVP1).
This array is analogous to array B1 of DS B (see this DS).
This integer array contains 7 values.
the type of eigenvalues,
the number of eigenvalues,
the type of eigenvectors,
the number of eigenvector components,
the existence (1) or not (0) of an error bound for the eigenvalues,
the number of couples in array VVP3, VVP4 on file,
0 if there are no eigenvectors, 1 otherwise.
This NTYVA type array contains:
This NTYVE type array, which exists if NEXVEC equals 1, contains:
A DS residing in core is written partially (it is a category 2 DS); only its 3 generic arrays and any associated arrays described in array VVP1 are written to sequential file via module SDECRI.
Similarly, a DS residing on file is read and transferred partially (its 3 generic arrays and any associated arrays described in array VVP1) to main memory via module SDLECT; only arrays VVP3 and VVP4 are addressed:
The contents (total or partial) of a DS VVPR can be printed by module IMVVPR. Preprocessor IMAGXX is used when a conversational call of IMVVPR is desired.
DS VVPR is created using different modules corresponding to different methods (Lanczos, sub-space, etc.).