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template<typename T>
void ptts2(integer *n, integer *nrhs, T *d, T *e, T *b, integer *ldb)# PTTS2 solves a tridiagonal system of the form AX=B using
the L D LH factorization computed by spttrf.
Purpose:
PTTS2 solves a tridiagonal system of the form A * X = B using the L*D*L**T factorization of A computed by SPTTRF. D is a diagonal matrix specified in the vector D, L is a unit bidiagonal matrix whose subdiagonal is specified in the vector E, and X and B are N by NRHS matrices.
- Parameters:
N – [in]
N is INTEGER
The order of the tridiagonal matrix A. N >= 0.
NRHS – [in]
NRHS is INTEGER
The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.
D – [in]
D is REAL array, dimension (N)
The n diagonal elements of the diagonal matrix D from the L*D*L**T factorization of A.
E – [in]
E is REAL array, dimension (N-1)
The (n-1) subdiagonal elements of the unit bidiagonal factor L from the L*D*L**T factorization of A. E can also be regarded as the superdiagonal of the unit bidiagonal factor U from the factorization A = U**T*D*U.
B – [inout]
B is REAL array, dimension (LDB,NRHS)
On entry, the right hand side vectors B for the system of linear equations.
On exit, the solution vectors, X.LDB – [in]
LDB is INTEGER
The leading dimension of the array B. LDB >= fla_max(1,N).