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- ____TTTTRRRREEEEDDDD3333((((3333FFFF)))) ____TTTTRRRREEEEDDDD3333((((3333FFFF))))
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- 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.
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- SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ttttrrrreeeedddd3333((((nnnn,,,, nnnnvvvv,,,, aaaa,,,, dddd,,,, eeee,,,, eeee2222))))
- iiiinnnntttteeeeggggeeeerrrr nnnn,,,, nnnnvvvv
- ddddoooouuuubbbblllleeee pppprrrreeeecccciiiissssiiiioooonnnn aaaa((((nnnnvvvv)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, eeee2222((((nnnn))))
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- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ssssttttrrrreeeedddd3333((((nnnn,,,, nnnnvvvv,,,, aaaa,,,, dddd,,,, eeee,,,, eeee2222))))
- iiiinnnntttteeeeggggeeeerrrr nnnn,,,, nnnnvvvv
- rrrreeeeaaaallll aaaa((((nnnnvvvv)))),,,, dddd((((nnnn)))),,,, eeee((((nnnn)))),,,, eeee2222((((nnnn))))
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- On Input n is the order of the matrix.
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- NNNNVVVV must be set to the dimension of the array parameter A as declared in
- the calling program dimension statement.
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- 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
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- AAAA contains information about the orthogonal transformations used in the
- reduction.
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- DDDD contains the diagonal elements of the tridiagonal matrix.
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- EEEE contains the subdiagonal elements of the tridiagonal matrix in its last
- N-1 positions. E(1) is set to zero.
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- 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
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- PPPPaaaaggggeeee 1111
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