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IRIX 6.2 Development Libraries
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COMHES.z
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COMHES
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Text File
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1996-03-14
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3KB
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67 lines
____CCCCOOOOMMMMHHHHEEEESSSS((((3333FFFF)))) ____CCCCOOOOMMMMHHHHEEEESSSS((((3333FFFF))))
NNNNAAAAMMMMEEEE
COMHES, SCOMHES - EISPACK routine. Given a COMPLEX 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 ccccoooommmmhhhheeeessss((((nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, aaaarrrr,,,, aaaaiiii,,,, iiiinnnntttt))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaarrrr((((nnnnmmmm,,,,nnnn)))),,,, aaaaiiii((((nnnnmmmm,,,,nnnn))))
iiiinnnntttteeeeggggeeeerrrr iiiinnnntttt((((iiiigggghhhh))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssccccoooommmmhhhheeeessss((((nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, aaaarrrr,,,, aaaaiiii,,,, iiiinnnntttt))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh
rrrreeeeaaaallll aaaarrrr((((nnnnmmmm,,,,nnnn)))),,,, aaaaiiii((((nnnnmmmm,,,,nnnn))))
iiiinnnntttteeeeggggeeeerrrr iiiinnnntttt((((iiiigggghhhh))))
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 CBAL.
If CBAL has not been used, set LOW=1, IGH=N.
AAAARRRR and AI contain the real and imaginary parts, respectively, of the
complex input matrix. On OUTPUT
AAAARRRR and AI contain the real and imaginary parts, respectively, of the
Hessenberg matrix. The multipliers which were used in the reduction are
stored in the remaining triangles under the Hessenberg matrix.
IIIINNNNTTTT contains information on the rows and columns interchanged in the
reduction. Only elements LOW through IGH are used. Calls CDIV for
complex division. Questions and comments should be directed to B. S.
Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE NATIONAL LABORATORY
PPPPaaaaggggeeee 1111