cptts2
cptts2 - solve a tridiagonal system of the form A * X = B using the factorization A = U'*D*U or A = L*D*L' computed by CPTTRF
SUBROUTINE CPTTS2( IUPLO, N, NRHS, D, E, B, LDB)
COMPLEX E(*), B(LDB,*)
INTEGER IUPLO, N, NRHS, LDB
REAL D(*)
SUBROUTINE CPTTS2_64( IUPLO, N, NRHS, D, E, B, LDB)
COMPLEX E(*), B(LDB,*)
INTEGER*8 IUPLO, N, NRHS, LDB
REAL D(*)
SUBROUTINE CPTTS2( IUPLO, N, NRHS, D, E, B, [LDB])
COMPLEX, DIMENSION(:) :: E
COMPLEX, DIMENSION(:,:) :: B
INTEGER :: IUPLO, N, NRHS, LDB
REAL, DIMENSION(:) :: D
SUBROUTINE CPTTS2_64( IUPLO, N, NRHS, D, E, B, [LDB])
COMPLEX, DIMENSION(:) :: E
COMPLEX, DIMENSION(:,:) :: B
INTEGER(8) :: IUPLO, N, NRHS, LDB
REAL, DIMENSION(:) :: D
#include <sunperf.h>
void cptts2(int iuplo, int n, int nrhs, float *d, complex *e, complex *b, int ldb);
void cptts2_64(long iuplo, long n, long nrhs, float *d, complex *e, complex *b, long ldb);
cptts2 solves a tridiagonal system of the form
A * X = B
using the factorization A = U'*D*U or A = L*D*L' computed by CPTTRF.
D is a diagonal matrix specified in the vector D, U (or L) is a unit
bidiagonal matrix whose superdiagonal (subdiagonal) is specified in
the vector E, and X and B are N by NRHS matrices.
-
* IUPLO (input)
-
Specifies the form of the factorization and whether the
vector E is the superdiagonal of the upper bidiagonal factor
U or the subdiagonal of the lower bidiagonal factor L.
-
* N (input)
-
The order of the tridiagonal matrix A. N >= 0.
-
* NRHS (input)
-
The number of right hand sides, i.e., the number of columns
of the matrix B. NRHS >= 0.
-
* D (input)
-
The n diagonal elements of the diagonal matrix D from the
factorization A = U'*D*U or A = L*D*L'.
-
* E (input)
-
If IUPLO = 1, the (n-1) superdiagonal elements of the unit
bidiagonal factor U from the factorization A = U'*D*U.
If IUPLO = 0, the (n-1) subdiagonal elements of the unit
bidiagonal factor L from the factorization A = L*D*L'.
-
* B (input/output)
-
On entry, the right hand side vectors B for the system of
linear equations.
On exit, the solution vectors, X.
-
* LDB (input)
-
The leading dimension of the array B. LDB >= max(1,N).