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IRIX 6.2 Development Libraries
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TRED3.z
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TRED3
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Text File
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1996-03-14
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3KB
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67 lines
____TTTTRRRREEEEDDDD3333((((3333FFFF)))) ____TTTTRRRREEEEDDDD3333((((3333FFFF))))
NNNNAAAAMMMMEEEE
TRED3, STRED3 - EISPACK routine. This subroutine reduces a REAL
SYMMETRIC matrix, stored as a one-dimensional array, to a symmetric
tridiagonal matrix using orthogonal similarity transformations.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ttttrrrreeeedddd3333((((nnnn,,,, nnnnvvvv,,,, aaaa,,,, dddd,,,, eeee,,,, eeee2222))))
iiiinnnntttteeeeggggeeeerrrr nnnn,,,, nnnnvvvv
ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnvvvv)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, eeee2222((((nnnn))))
ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssttttrrrreeeedddd3333((((nnnn,,,, nnnnvvvv,,,, aaaa,,,, dddd,,,, eeee,,,, eeee2222))))
iiiinnnntttteeeeggggeeeerrrr nnnn,,,, nnnnvvvv
rrrreeeeaaaallll aaaa((((nnnnvvvv)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, eeee2222((((nnnn))))
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Input n 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 the lower triangle of the real symmetric input matrix, stored
row-wise as a one-dimensional array, in its first N*(N+1)/2 positions.
On Output
AAAA contains information about the orthogonal transformations used in the
reduction.
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.
EEEE2222 contains the squares of the corresponding elements of E. E2 may
coincide with E if the squares are not needed. Questions and comments
should be directed to B. S. Garbow, APPLIED MATHEMATICS DIVISION, ARGONNE
NATIONAL LABORATORY
PPPPaaaaggggeeee 1111