TESTING/LIN/xlaenv.f(3)    Library Functions Manual    TESTING/LIN/xlaenv.f(3)

NAME
       TESTING/LIN/xlaenv.f

SYNOPSIS
   Functions/Subroutines
       subroutine xlaenv (ispec, nvalue)
           XLAENV

Function/Subroutine Documentation
   subroutine xlaenv (integer ispec, integer nvalue)
       XLAENV

       Purpose:


            XLAENV sets certain machine- and problem-dependent quantities
            which will later be retrieved by ILAENV.

       Parameters
           ISPEC

                     ISPEC is INTEGER
                     Specifies the parameter to be set in the COMMON array IPARMS.
                     = 1: the optimal blocksize; if this value is 1, an unblocked
                          algorithm will give the best performance.
                     = 2: the minimum block size for which the block routine
                          should be used; if the usable block size is less than
                          this value, an unblocked routine should be used.
                     = 3: the crossover point (in a block routine, for N less
                          than this value, an unblocked routine should be used)
                     = 4: the number of shifts, used in the nonsymmetric
                          eigenvalue routines
                     = 5: the minimum column dimension for blocking to be used;
                          rectangular blocks must have dimension at least k by m,
                          where k is given by ILAENV(2,...) and m by ILAENV(5,...)
                     = 6: the crossover point for the SVD (when reducing an m by n
                          matrix to bidiagonal form, if max(m,n)/min(m,n) exceeds
                          this value, a QR factorization is used first to reduce
                          the matrix to a triangular form)
                     = 7: the number of processors
                     = 8: another crossover point, for the multishift QR and QZ
                          methods for nonsymmetric eigenvalue problems.
                     = 9: maximum size of the subproblems at the bottom of the
                          computation tree in the divide-and-conquer algorithm
                          (used by xGELSD and xGESDD)
                     =10: ieee NaN arithmetic can be trusted not to trap
                     =11: infinity arithmetic can be trusted not to trap

           NVALUE

                     NVALUE is INTEGER
                     The value of the parameter specified by ISPEC.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 77 of file xlaenv.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/LIN/xlaenv.f(3)