table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dget39.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dget39.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/EIG/dget39.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine DGET39 (rmax, lmax, ninfo, knt)
DGET39
Function/Subroutine Documentation¶
subroutine DGET39 (double precision rmax, integer lmax, integer ninfo, integer knt)¶
DGET39
Purpose:
!> !> DGET39 tests DLAQTR, a routine for solving the real or !> special complex quasi upper triangular system !> !> op(T)*p = scale*c, !> or !> op(T + iB)*(p+iq) = scale*(c+id), !> !> in real arithmetic. T is upper quasi-triangular. !> If it is complex, then the first diagonal block of T must be !> 1 by 1, B has the special structure !> !> B = [ b(1) b(2) ... b(n) ] !> [ w ] !> [ w ] !> [ . ] !> [ w ] !> !> op(A) = A or A', where A' denotes the conjugate transpose of !> the matrix A. !> !> On input, X = [ c ]. On output, X = [ p ]. !> [ d ] [ q ] !> !> Scale is an output less than or equal to 1, chosen to avoid !> overflow in X. !> This subroutine is specially designed for the condition number !> estimation in the eigenproblem routine DTRSNA. !> !> The test code verifies that the following residual is order 1: !> !> ||(T+i*B)*(x1+i*x2) - scale*(d1+i*d2)|| !> ----------------------------------------- !> max(ulp*(||T||+||B||)*(||x1||+||x2||), !> (||T||+||B||)*smlnum/ulp, !> smlnum) !> !> (The (||T||+||B||)*smlnum/ulp term accounts for possible !> (gradual or nongradual) underflow in x1 and x2.) !>
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 !> Number of examples where INFO is nonzero. !>
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 102 of file dget39.f.
Author¶
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Version 3.12.0 | LAPACK |