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IRIX 6.2 Development Libraries
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complib.idb
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QZHES.z
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QZHES
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Text File
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1996-03-14
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3KB
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67 lines
____QQQQZZZZHHHHEEEESSSS((((3333FFFF)))) ____QQQQZZZZHHHHEEEESSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
QZHES, SQZHES - EISPACK routine. This subroutine is the first step of
the QZ algorithm for solving generalized matrix eigenvalue problems.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee qqqqzzzzhhhheeeessss((((nnnnmmmm,,,, nnnn,,,, aaaa,,,, bbbb,,,, mmmmaaaattttzzzz,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnmmmm,,,,nnnn)))),,,, bbbb((((nnnnmmmm,,,,nnnn)))),,,, zzzz((((nnnnmmmm,,,,nnnn))))
llllooooggggiiiiccccaaaallll mmmmaaaattttzzzz
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssqqqqzzzzhhhheeeessss((((nnnnmmmm,,,, nnnn,,,, aaaa,,,, bbbb,,,, mmmmaaaattttzzzz,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn
rrrreeeeaaaallll aaaa((((nnnnmmmm,,,,nnnn)))),,,, bbbb((((nnnnmmmm,,,,nnnn)))),,,, zzzz((((nnnnmmmm,,,,nnnn))))
llllooooggggiiiiccccaaaallll mmmmaaaattttzzzz
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
This subroutine accepts a pair of REAL GENERAL matrices and reduces one
of them to upper Hessenberg form and the other to upper triangular form
using orthogonal transformations. It is usually followed by QZIT,
QZVAL and, possibly, QZVEC.
On Input
NNNNMMMM must be set to the row dimension of two-dimensional array parameters
as declared in the calling program dimension statement.
NNNN is the order of the matrices.
AAAA contains a real general matrix.
BBBB contains a real general matrix.
MMMMAAAATTTTZZZZ should be set to .TRUE. if the right hand transformations are to be
accumulated for later use in computing eigenvectors, and to .FALSE.
otherwise. On Output
AAAA has been reduced to upper Hessenberg form. The elements below the
first subdiagonal have been set to zero.
BBBB has been reduced to upper triangular form. The elements below the main
diagonal have been set to zero.
ZZZZ contains the product of the right hand transformations if MATZ has been
set to .TRUE. Otherwise, Z is not referenced. Questions and comments
should be directed to B. S. Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE
NATIONAL LABORATORY
PPPPaaaaggggeeee 1111