Function

cblas_dtpmv

Multiplies a triangular matrix by a vector, then adds a vector (double precision).

Declaration

void cblas_dtpmv(const enum CBLAS_ORDER __Order, const enum CBLAS_UPLO __Uplo, const enum CBLAS_TRANSPOSE __TransA, const enum CBLAS_DIAG __Diag, const int __N, const double *__Ap, double *__X, const int __incX);

Parameters

Order

Specifies row-major (C) or column-major (Fortran) data ordering.

Uplo

Specifies whether to use the upper or lower triangle from the matrix. Valid values are 'U' or 'L'.

TransA

Specifies whether to use matrix A ('N' or 'n'), the transpose of A ('T' or 't'), or the conjugate of A ('C' or 'c').

Diag

Specifies whether the matrix is unit triangular. Possible values are 'U' (unit triangular) or 'N' (not unit triangular).

N

Order of matrix A and the number of elements in vectors x and y.

Ap

Matrix A.

X

Vector x.

incX

Stride within X. For example, if incX is 7, every 7th element is used.

Discussion

Computes A*x, AT*x, or conjg(AT)*x and stores the results in X.

See Also

Double-Precision Float Matrix Functions

cblas_dasum

Computes the sum of the absolute values of elements in a vector (double-precision).

cblas_daxpy

Computes a constant times a vector plus a vector (double-precision).

cblas_dcopy

Copies a vector to another vector (double-precision).

cblas_dgbmv

Scales a general band matrix, then multiplies by a vector, then adds a vector (double precision).

cblas_dgemm

Multiplies two matrices (double-precision).

cblas_dgemv

Multiplies a matrix by a vector (double precision).

cblas_dger

Multiplies vector X by the transpose of vector Y, then adds matrix A (double precison).

cblas_dnrm2

Computes the L2 norm (Euclidian length) of a vector (double precision).

cblas_drot

Applies a Givens rotation matrix to a pair of vectors.

cblas_drotg

Constructs a Givens rotation matrix.

cblas_drotm

Applies a modified Givens transformation (single precision).

cblas_drotmg

Generates a modified Givens rotation matrix.

cblas_dsbmv

Scales a symmetric band matrix, then multiplies by a vector, then adds a vector (double precision).

cblas_dscal

Multiplies each element of a vector by a constant (double-precision).

cblas_dspmv

Scales a packed symmetric matrix, then multiplies by a vector, then scales and adds another vector (double precision).

cblas_dspr

Rank one update: adds a packed symmetric matrix to the product of a scaling factor, a vector, and its transpose (double precision).

cblas_dspr2

Rank two update of a packed symmetric matrix using two vectors (single precision).

cblas_dswap

Exchanges the elements of two vectors (double precision).

cblas_dsymm

Multiplies a matrix by a symmetric matrix (double-precision).

cblas_dsymv

Scales a symmetric matrix, multiplies by a vector, then scales and adds another vector (single precision).

cblas_dsyr

Rank one update: adds a symmetric matrix to the product of a scaling factor, a vector, and its transpose (double precision).

cblas_dsyr2

Rank two update of a symmetric matrix using two vectors (single precision).

cblas_dsyr2k

Performs a rank-2k update of a symmetric matrix (double precision).

cblas_dsyrk

Rank-k update—multiplies a symmetric matrix by its transpose and adds a second matrix (double precision).

cblas_dtbmv

Scales a triangular band matrix, then multiplies by a vector (double precision).

cblas_dtbsv

Solves a triangular banded system of equations.

cblas_dtpsv

Solves a packed triangular system of equations.

cblas_dtrmm

Scales a triangular matrix and multiplies it by a matrix.

cblas_dtrmv

Multiplies a triangular matrix by a vector.

cblas_dtrsm

Solves a triangular system of equations with multiple values for the right side.

cblas_dtrsv

Solves a triangular system of equations with a single value for the right side.