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IRIX 6.2 Development Libraries
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TRED2.z
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TRED2
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Text File
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1996-03-14
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3KB
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67 lines
____TTTTRRRREEEEDDDD2222((((3333FFFF)))) ____TTTTRRRREEEEDDDD2222((((3333FFFF))))
NNNNAAAAMMMMEEEE
TRED2, STRED2 - EISPACK routine. This subroutine reduces a REAL
SYMMETRIC matrix to a symmetric tridiagonal matrix using and accumulating
orthogonal similarity transformations.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ttttrrrreeeedddd2222((((nnnnmmmm,,,, nnnn,,,, aaaa,,,, dddd,,,, eeee,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnmmmm,,,,nnnn)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, zzzz((((nnnnmmmm,,,,nnnn))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssttttrrrreeeedddd2222((((nnnnmmmm,,,, nnnn,,,, aaaa,,,, dddd,,,, eeee,,,, zzzz))))
iiiinnnntttteeeeggggeeeerrrr nnnnmmmm,,,, nnnn
rrrreeeeaaaallll aaaa((((nnnnmmmm,,,,nnnn)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, zzzz((((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.
AAAA contains the real symmetric input matrix. Only the lower triangle of
the matrix need be supplied. On Output
DDDD contains the diagonal elements of the tridiagonal matrix.
EEEE contains the subdiagonal elements of the tridiagonal matrix in its last
N-1 positions. E(1) is set to zero.
ZZZZ contains the orthogonal transformation matrix produced in the
reduction.
AAAA and Z may coincide. If distinct, A is unaltered. Questions and
comments should be directed to B. S. Garbow, APPLIED MATHEMATICS
DIVISION, ARGONNE NATIONAL LABORATORY
PPPPaaaaggggeeee 1111