◆ Ztbsv()

Solution of Ax = b, A^Tx = b or A^Hx = b (complex triangular band matrices) (BLAS 2)

Purpose: This routine solves one of the systems of equations
A*x = b, A^T*x = b or A^H*x = b

where b and x are n element vectors and A is an n x n unit or non-unit, upper or lower triangular band matrix, with k+1 diagonals.

No test for singularity or near-singularity is included in this routine. Such tests must be performed before calling this routine.

Parameters

[in]	Uplo	Specifies whether the matrix is an upper or lower triangular matrix as follows: = "U": A is an upper triangular matrix. = "L": A is an lower triangular matrix.
[in]	Trans	Specifies the equation to be solved as follows: = "N": Ax = b. = "T": A^Tx = b. = "C": A^H*x = b.
[in]	Diag	Specifies whether or not A is unit triangular as follows: = "N": A is not assumed to be unit triangular. = "U": A is assumed to be unit triangular. (Diagonal elements of Ab() are not referenced)
[in]	N	Order of the matrix A. (N >= 0) (If N = 0, returns without computation)
[in]	K	Number of super/sub-diagonals of the matrix A. (K >= 0)
[in]	Ab_IJ	An element Ab(I, J) of the array Ab(). Starting from this location, N x N triangular band matrix A is stored in symmetric band matrix form (K+1 x N). (Upper or lower part is to be stored in accordance with Uplo)
[in]	LdAb	Leading dimension of the two dimensional array Ab(). (LdAb >= K + 1)
[in]	X_I	An element X(I) of the array X(). [in] Starting from this location, N vector b is stored with element spacing IncX. [out] Starting from this location, solution x (N vector) of Ax = b, A^Tx = b or A^H*x = b is stored with element spacing IncX.
[in]	IncX	(Optional) Element spacing of vector x in the array X(). (IncX <> 0) (default = 1)