version 1.1.1.1, 2010/01/26 15:22:46
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version 1.8, 2011/07/22 07:38:06
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SUBROUTINE DLAGTS( JOB, N, A, B, C, D, IN, Y, TOL, INFO ) |
SUBROUTINE DLAGTS( JOB, N, A, B, C, D, IN, Y, TOL, INFO ) |
* |
* |
* -- LAPACK auxiliary routine (version 3.2) -- |
* -- LAPACK auxiliary routine (version 3.3.1) -- |
* -- LAPACK is a software package provided by Univ. of Tennessee, -- |
* -- LAPACK is a software package provided by Univ. of Tennessee, -- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* November 2006 |
* -- April 2011 -- |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER INFO, JOB, N |
INTEGER INFO, JOB, N |
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* |
* |
* DLAGTS may be used to solve one of the systems of equations |
* DLAGTS may be used to solve one of the systems of equations |
* |
* |
* (T - lambda*I)*x = y or (T - lambda*I)'*x = y, |
* (T - lambda*I)*x = y or (T - lambda*I)**T*x = y, |
* |
* |
* where T is an n by n tridiagonal matrix, for x, following the |
* where T is an n by n tridiagonal matrix, for x, following the |
* factorization of (T - lambda*I) as |
* factorization of (T - lambda*I) as |
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* and, if overflow would otherwise occur, the diagonal |
* and, if overflow would otherwise occur, the diagonal |
* elements of U are to be perturbed. See argument TOL |
* elements of U are to be perturbed. See argument TOL |
* below. |
* below. |
* = 2: The equations (T - lambda*I)'x = y are to be solved, |
* = 2: The equations (T - lambda*I)**Tx = y are to be solved, |
* but diagonal elements of U are not to be perturbed. |
* but diagonal elements of U are not to be perturbed. |
* = -2: The equations (T - lambda*I)'x = y are to be solved |
* = -2: The equations (T - lambda*I)**Tx = y are to be solved |
* and, if overflow would otherwise occur, the diagonal |
* and, if overflow would otherwise occur, the diagonal |
* elements of U are to be perturbed. See argument TOL |
* elements of U are to be perturbed. See argument TOL |
* below. |
* below. |