stdlib_ilaenv2stage Function
public function stdlib_ilaenv2stage(ispec, name, opts, n1, n2, n3, n4)
ILAENV2STAGE is called from the LAPACK routines to choose problem-dependent parameters for the local environment. See ISPEC for a description of the parameters. It sets problem and machine dependent parameters useful for *_2STAGE and related subroutines. ILAENV2STAGE returns an INTEGER if ILAENV2STAGE >= 0: ILAENV2STAGE returns the value of the parameter specified by ISPEC if ILAENV2STAGE < 0: if ILAENV2STAGE = -k, the k-th argument had an illegal value. This version provides a set of parameters which should give good, but not optimal, performance on many of the currently available computers for the 2-stage solvers. Users are encouraged to modify this subroutine to set the tuning parameters for their particular machine using the option and problem size information in the arguments. This routine will not function correctly if it is converted to all lower case. Converting it to all upper case is allowed.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| integer(kind=ilp), | intent(in) | :: | ispec | |||
| character(len=*), | intent(in) | :: | name | |||
| character(len=*), | intent(in) | :: | opts | |||
| integer(kind=ilp), | intent(in) | :: | n1 | |||
| integer(kind=ilp), | intent(in) | :: | n2 | |||
| integer(kind=ilp), | intent(in) | :: | n3 | |||
| integer(kind=ilp), | intent(in) | :: | n4 |