table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dget31.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dget31.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dget31.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine DGET31 (rmax, lmax, ninfo, knt)
DGET31
Function/Subroutine Documentation¶
subroutine DGET31 (double precision rmax, integer lmax, integer, dimension( 2 ) ninfo, integer knt)¶
DGET31
Purpose:
!> !> DGET31 tests DLALN2, a routine for solving !> !> (ca A - w D)X = sB !> !> where A is an NA by NA matrix (NA=1 or 2 only), w is a real (NW=1) or !> complex (NW=2) constant, ca is a real constant, D is an NA by NA real !> diagonal matrix, and B is an NA by NW matrix (when NW=2 the second !> column of B contains the imaginary part of the solution). The code !> returns X and s, where s is a scale factor, less than or equal to 1, !> which is chosen to avoid overflow in X. !> !> If any singular values of ca A-w D are less than another input !> parameter SMIN, they are perturbed up to SMIN. !> !> The test condition is that the scaled residual !> !> norm( (ca A-w D)*X - s*B ) / !> ( max( ulp*norm(ca A-w D), SMIN )*norm(X) ) !> !> should be on the order of 1. Here, ulp is the machine precision. !> Also, it is verified that SCALE is less than or equal to 1, and that !> XNORM = infinity-norm(X). !>
Parameters
RMAX
!> RMAX is DOUBLE PRECISION !> Value of the largest test ratio. !>
LMAX
!> LMAX is INTEGER !> Example number where largest test ratio achieved. !>
NINFO
!> NINFO is INTEGER array, dimension (2) !> NINFO(1) = number of examples with INFO less than 0 !> NINFO(2) = number of examples with INFO greater than 0 !>
KNT
!> KNT is INTEGER !> Total number of examples tested. !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 90 of file dget31.f.
Author¶
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Version 3.12.0 | LAPACK |