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IRIX 6.2 Development Libraries
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COMLR.z
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COMLR
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Text File
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1996-03-14
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4KB
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67 lines
____CCCCOOOOMMMMLLLLRRRR((((3333FFFF)))) ____CCCCOOOOMMMMLLLLRRRR((((3333FFFF))))
NNNNAAAAMMMMEEEE
COMLR, SCOMLR - EISPACK routine. This subroutine finds the
eigenvalues of a COMPLEX UPPER Hessenberg matrix by the modified LR
method.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ccccoooommmmllllrrrr((((nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, hhhhrrrr,,,, hhhhiiii,,,, wwwwrrrr,,,, wwwwiiii,,,, iiiieeeerrrrrrrr))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, iiiieeeerrrrrrrr
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn hhhhrrrr((((nnnnmmmm,,,,nnnn)))),,,, hhhhiiii((((nnnnmmmm,,,,nnnn)))),,,, wwwwrrrr((((nnnn)))),,,, wwwwiiii((((nnnn))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssccccoooommmmllllrrrr((((nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, hhhhrrrr,,,, hhhhiiii,,,, wwwwrrrr,,,, wwwwiiii,,,, iiiieeeerrrrrrrr))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, lllloooowwww,,,, iiiigggghhhh,,,, iiiieeeerrrrrrrr
rrrreeeeaaaallll hhhhrrrr((((nnnnmmmm,,,,nnnn)))),,,, hhhhiiii((((nnnnmmmm,,,,nnnn)))),,,, wwwwrrrr((((nnnn)))),,,, wwwwiiii((((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 CBAL.
If CBAL has not been used, set LOW=1, IGH=N.
HHHHRRRR and HI contain the real and imaginary parts, respectively, of the
complex upper Hessenberg matrix. Their lower triangles below the
subdiagonal contain the multipliers which were used in the reduction by
COMHES, if performed. On OUTPUT The upper Hessenberg portions of HR and
HI have been destroyed. Therefore, they must be saved before calling
COMLR if subsequent calculation of eigenvectors is to be performed.
WWWWRRRR and WI contain the real and imaginary parts, respectively, of the
eigenvalues. If an error exit is made, the eigenvalues should be correct
for indices IERR+1,...,N.
IIIIEEEERRRRRRRR is set to Zero for normal return, J if the J-th
eigenvalue has not been
determined after a total of 30*N iterations. Calls CSROOT for complex
square root. Calls CDIV for complex division. Questions and comments
should be directed to B. S. Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE
NATIONAL LABORATORY
PPPPaaaaggggeeee 1111