◆ dtrsm()

Solution of op(A)X = αB or Xop(A) = αB (op(A) = A or A^T) (triangular matrices) (BLAS 3)

Purpose: This routine solves one of the matrix equations
op(A)*X = alpha*B or X*op(A) = alpha*B

where alpha is a scalar, X and B are m x n matrices, A is a unit or non-unit, upper or lower triangular matrix and op(A) is one of
op(A) = A or op(A) = A^T

The matrix X is overwritten on B.

Parameters

[in]	side	Specifies whether op(A) ap[lap]ears on the left or right of X as follows: = 'L': op(A)X = alphaB. = 'R': Xop(A) = alphaB.
[in]	uplo	Specifies whether the matrix A is an upper or lower triangular matrix as follows: = 'U': A is an upper triangular matrix. = 'L': A is an lower triangular matrix.
[in]	transa	Specifies the form of op(A) to be used in the matrix multiplication as follows: = 'N': op(A) = A. = 'T' or 'C': op(A) = A^T.
[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 a[][] are not referenced)
[in]	m	Number of rows of the matrix B. (m >= 0) (If m = 0, returns without computation)
[in]	n	Number of columns of the matrix B. (n >= 0) (If n = 0, returns without computation)
[in]	alpha	Scalar alpha. When alpha is zero then a[][] is not referenced and B need not be set on entry.
[in]	lda	Leading dimension of the two dimensional array a[][]. (lda >= max(1, m) when side = 'L', lda >= max(1, n) when side = 'R')
[in]	a[][]	Array a[la][lda] (la >= m when side = 'L', la >= n when side = 'R') m x m triangular matrix A when side = 'L', or n x n triangular matrix A when side = 'R'. According to uplo, only the upper or lower triangular part is to be referenced.
[in]	ldb	Leading dimension of the two dimensional array b[][]. (ldb >= max(1, m))
[in,out]	b[][]	Array b[lb][ldb] (lb >= n) [in] m x n right-hand side matrix B. [out] Overwritten by the m x n solution matrix X.