version 1.18, 2018/05/29 07:17:56
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version 1.19, 2020/05/21 21:45:58
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*> \param[in,out] TOL |
*> \param[in,out] TOL |
*> \verbatim |
*> \verbatim |
*> TOL is DOUBLE PRECISION |
*> TOL is DOUBLE PRECISION |
*> On entry, with JOB .lt. 0, TOL should be the minimum |
*> On entry, with JOB < 0, TOL should be the minimum |
*> perturbation to be made to very small diagonal elements of U. |
*> perturbation to be made to very small diagonal elements of U. |
*> TOL should normally be chosen as about eps*norm(U), where eps |
*> TOL should normally be chosen as about eps*norm(U), where eps |
*> is the relative machine precision, but if TOL is supplied as |
*> is the relative machine precision, but if TOL is supplied as |
*> non-positive, then it is reset to eps*max( abs( u(i,j) ) ). |
*> non-positive, then it is reset to eps*max( abs( u(i,j) ) ). |
*> If JOB .gt. 0 then TOL is not referenced. |
*> If JOB > 0 then TOL is not referenced. |
*> |
*> |
*> On exit, TOL is changed as described above, only if TOL is |
*> On exit, TOL is changed as described above, only if TOL is |
*> non-positive on entry. Otherwise TOL is unchanged. |
*> non-positive on entry. Otherwise TOL is unchanged. |
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*> \param[out] INFO |
*> \param[out] INFO |
*> \verbatim |
*> \verbatim |
*> INFO is INTEGER |
*> INFO is INTEGER |
*> = 0 : successful exit |
*> = 0: successful exit |
*> .lt. 0: if INFO = -i, the i-th argument had an illegal value |
*> < 0: if INFO = -i, the i-th argument had an illegal value |
*> .gt. 0: overflow would occur when computing the INFO(th) |
*> > 0: overflow would occur when computing the INFO(th) |
*> element of the solution vector x. This can only occur |
*> element of the solution vector x. This can only occur |
*> when JOB is supplied as positive and either means |
*> when JOB is supplied as positive and either means |
*> that a diagonal element of U is very small, or that |
*> that a diagonal element of U is very small, or that |
*> the elements of the right-hand side vector y are very |
*> the elements of the right-hand side vector y are very |
*> large. |
*> large. |
*> \endverbatim |
*> \endverbatim |
* |
* |
* Authors: |
* Authors: |