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IRIX 6.2 Development Libraries
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TRBAK3.z
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TRBAK3
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Text File
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1996-03-14
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3KB
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67 lines
____TTTTRRRRBBBBAAAAKKKK3333((((3333FFFF)))) ____TTTTRRRRBBBBAAAAKKKK3333((((3333FFFF))))
NNNNAAAAMMMMEEEE
TRBAK3, STRBAK3 - EISPACK routine. This subroutine forms the
eigenvectors of a REAL SYMMETRIC matrix by back transforming those of the
corresponding symmetric tridiagonal matrix determined by TRED3.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ttttrrrrbbbbaaaakkkk3333((((nnnnmmmm,,,, nnnn,,,, nnnnvvvv,,,, aaaa,,,, mmmm,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, nnnnvvvv,,,, mmmm
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnvvvv)))),,,, zzzz((((nnnnmmmm,,,,mmmm))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssttttrrrrbbbbaaaakkkk3333((((nnnnmmmm,,,, nnnn,,,, nnnnvvvv,,,, aaaa,,,, mmmm,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn,,,, nnnnvvvv,,,, mmmm
rrrreeeeaaaallll aaaa((((nnnnvvvv)))),,,, 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.
NNNN is the order of the matrix.
NNNNVVVV must be set to the dimension of the array parameter A as declared in
the calling program dimension statement.
AAAA contains information about the orthogonal transformations used in the
reduction by TRED3 in its first N*(N+1)/2 positions.
MMMM is the number of eigenvectors to be back transformed.
ZZZZ contains the eigenvectors to be back transformed in its first M
columns. On Output
ZZZZ contains the transformed eigenvectors in its first M columns. Note
that TRBAK3 preserves vector Euclidean norms. Questions and comments
should be directed to b. s. Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE
NATIONAL LABORATORY
PPPPaaaaggggeeee 1111