table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/sptt02.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/sptt02.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/sptt02.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine SPTT02 (n, nrhs, d, e, x, ldx, b, ldb, resid)
SPTT02
Function/Subroutine Documentation¶
subroutine SPTT02 (integer n, integer nrhs, real, dimension( * ) d, real, dimension( * ) e, real, dimension( ldx, * ) x, integer ldx, real, dimension( ldb, * ) b, integer ldb, real resid)¶
SPTT02
Purpose:
!> !> SPTT02 computes the residual for the solution to a symmetric !> tridiagonal system of equations: !> RESID = norm(B - A*X) / (norm(A) * norm(X) * EPS), !> where EPS is the machine epsilon. !>
Parameters
N
!> N is INTEGER !> The order of the matrix A. !>
NRHS
!> NRHS is INTEGER !> The number of right hand sides, i.e., the number of columns !> of the matrices B and X. NRHS >= 0. !>
D
!> D is REAL array, dimension (N) !> The n diagonal elements of the tridiagonal matrix A. !>
E
!> E is REAL array, dimension (N-1) !> The (n-1) subdiagonal elements of the tridiagonal matrix A. !>
X
!> X is REAL array, dimension (LDX,NRHS) !> The n by nrhs matrix of solution vectors X. !>
LDX
!> LDX is INTEGER !> The leading dimension of the array X. LDX >= max(1,N). !>
B
!> B is REAL array, dimension (LDB,NRHS) !> On entry, the n by nrhs matrix of right hand side vectors B. !> On exit, B is overwritten with the difference B - A*X. !>
LDB
!> LDB is INTEGER !> The leading dimension of the array B. LDB >= max(1,N). !>
RESID
!> RESID is REAL !> norm(B - A*X) / (norm(A) * norm(X) * EPS) !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 103 of file sptt02.f.
Author¶
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