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IRIX 6.2 Development Libraries
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ORTBAK.z
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ORTBAK
Wrap
Text File
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1996-03-14
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3KB
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67 lines
____OOOORRRRTTTTBBBBAAAAKKKK((((3333FFFF)))) ____OOOORRRRTTTTBBBBAAAAKKKK((((3333FFFF))))
NNNNAAAAMMMMEEEE
ORTBAK, SORTBAK - EISPACK routine. This subroutine forms the
eigenvectors of a REAL GENERAL matrix by back transforming those of the
corresponding upper Hessenberg matrix determined by ORTHES.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee oooorrrrttttbbbbaaaakkkk((((nnnnmmmm,,,, lllloooowwww,,,, iiiigggghhhh,,,, aaaa,,,, oooorrrrtttt,,,, mmmm,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, lllloooowwww,,,, iiiigggghhhh,,,, mmmm
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnmmmm,,,,iiiigggghhhh)))),,,, oooorrrrtttt((((iiiigggghhhh)))),,,, zzzz((((nnnnmmmm,,,,mmmm))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssoooorrrrttttbbbbaaaakkkk((((nnnnmmmm,,,, lllloooowwww,,,, iiiigggghhhh,,,, aaaa,,,, oooorrrrtttt,,,, mmmm,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, lllloooowwww,,,, iiiigggghhhh,,,, mmmm
rrrreeeeaaaallll aaaa((((nnnnmmmm,,,,iiiigggghhhh)))),,,, oooorrrrtttt((((iiiigggghhhh)))),,,, zzzz((((nnnnmmmm,,,,mmmm))))
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On INPUT
NNNNMMMM must be set to the row dimension of two-dimensional array parameters
as declared in the calling program dimension statement.
LLLLOOOOWWWW and IGH are integers determined by the balancing subroutine BALANC.
If BALANC has not been used, set LOW=1 and IGH equal to the order of
the matrix.
AAAA contains information about the orthogonal trans- formations used in the
reduction by ORTHES in its strict lower triangle.
OOOORRRRTTTT contains further information about the trans- formations used in the
reduction by ORTHES. Only elements LOW through IGH are used.
MMMM is the number of columns of Z to be back transformed.
ZZZZ contains the real and imaginary parts of the eigen- vectors to be back
transformed in its first M columns. On OUTPUT
ZZZZ contains the real and imaginary parts of the transformed eigenvectors
in its first M columns.
OOOORRRRTTTT has been altered. NOTE that ORTBAK preserves vector Euclidean norms.
Questions and comments should be directed to B. S. Garbow, APPLIED
MATHEMATICS DIVISION, ARGONNE NATIONAL LABORATORY
PPPPaaaaggggeeee 1111