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IRIX 6.2 Development Libraries
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ELMHES.z
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ELMHES
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Text File
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1996-03-14
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3KB
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67 lines
____EEEELLLLMMMMHHHHEEEESSSS((((3333FFFF)))) ____EEEELLLLMMMMHHHHEEEESSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
elmhes, selmhes - EISPACK routine. Given a REAL GENERAL matrix, this
subroutine reduces a submatrix situated in rows and columns LOW through
IGH to upper Hessenberg form by stabilized elementary similarity
transformations.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee eeeellllmmmmhhhheeeessss((((nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, aaaa,,,, iiiinnnntttt))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, iiiinnnntttt((((iiiigggghhhh))))
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnmmmm,,,,nnnn))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee sssseeeellllmmmmhhhheeeessss((((nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, aaaa,,,, iiiinnnntttt))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, iiiinnnntttt((((iiiigggghhhh))))
rrrreeeeaaaallll aaaa((((nnnnmmmm,,,,nnnn))))
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
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 matrix.
LLLLOOOOWWWW and IGH are integers determined by the balancing subroutine BALANC.
If BALANC has not been used, set LOW=1, IGH=N.
AAAA contains the input matrix. On OUTPUT
AAAA contains the Hessenberg matrix. The multipliers which were used in the
reduction are stored in the remaining triangle under the Hessenberg
matrix.
IIIINNNNTTTT contains information on the rows and columns interchanged in the
reduction. Only elements LOW through IGH are used. Questions and
comments should be directed to B. S. Garbow, APPLIED MATHEMATICS
DIVISION, ARGONNE NATIONAL LABORATORY
PPPPaaaaggggeeee 1111