
NAMEzptts2.f SYNOPSISFunctions/Subroutinessubroutine zptts2 (IUPLO, N, NRHS, D, E, B, LDB) Function/Subroutine Documentationsubroutine zptts2 (integerIUPLO, integerN, integerNRHS, double precision, dimension( * )D, complex*16, dimension( * )E, complex*16, dimension( ldb, * )B, integerLDB)ZPTTS2 solves a tridiagonal system of the form AX=B using the L D LH factorization computed by spttrf. Purpose:ZPTTS2 solves a tridiagonal system of the form A * X = B using the factorization A = U**H *D*U or A = L*D*L**H computed by ZPTTRF. 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
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IUPLO is INTEGER 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. = 1: A = U**H *D*U, E is the superdiagonal of U = 0: A = L*D*L**H, E is the subdiagonal of LN N is INTEGER The order of the tridiagonal matrix A. N >= 0.NRHS NRHS is INTEGER The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.D D is DOUBLE PRECISION array, dimension (N) The n diagonal elements of the diagonal matrix D from the factorization A = U**H *D*U or A = L*D*L**H.E E is COMPLEX*16 array, dimension (N1) If IUPLO = 1, the (n1) superdiagonal elements of the unit bidiagonal factor U from the factorization A = U**H*D*U. If IUPLO = 0, the (n1) subdiagonal elements of the unit bidiagonal factor L from the factorization A = L*D*L**H.B B is DOUBLE PRECISION 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 LDB is INTEGER The leading dimension of the array B. LDB >= max(1,N). Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 114 of file zptts2.f.
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