Function

# sparse_matrix_vector_product_dense_float(_:_:_:_:_:_:_:)

Multiplies the dense vector x by the sparse matrix A and adds the result to the dense vector y, with all operands containing single-precision values.

## Parameters

`transa`

Specifies whether to perform the operation with A or the transpose of A. Must be one of CblasNoTrans or CblasTrans.

`alpha`

Scalar multiplier of A.

`A`

The sparse matrix, A.

`x`

Pointer to the dense vector x. The dimension must be the number of columns of the matrix A when `transa` is no transpose or the number of rows of the matrix A when `transa` is transpose. The behavior of this function is undefined if this is not met. Negative strides are supported. Note, unlike dense BLAS routines, the pointer points to the last element when stride is negative.

`incx`

Increment between valid values in the dense vector x. Negative strides are supported.

`y`

Pointer to the dense vector y. The dimension must be the number of rows of the matrix A when `transa` is no transpose or the number of columns of the matrix A when `transa` is transpose. The behavior of this function is undefined if this is not met. Negative strides are supported. Note, unlike dense BLAS routines, the pointer points to the last element when stride is negative.

`incy`

Increment between valid values in the dense vector y. Negative strides are supported.

## Return Value

On success `SPARSE_SUCCESS` (`y` will be updated with result of the operation). Retruns `SPARSE_ILLEGAL_PARAMETER` if `transa` is invalid and `y` will be unchanged.

## Discussion

Multiplies the dense vector x by the sparse matrix A and adds the result to the dense vector y (y = alpha * op(A) * x + y, where op(A) is either A or the transpose of A).If the desired operation is y = A * x, then an efficient option is to create the `y` buffer of zeros and then perform the operation with the zero filled `y`.

### Matrix-Vector Operations

`func sparse_matrix_vector_product_dense_double(CBLAS_TRANSPOSE, Double, sparse_matrix_double!, UnsafePointer<Double>!, sparse_stride, UnsafeMutablePointer<Double>!, sparse_stride) -> sparse_status`

Multiplies the dense vector x by the sparse matrix A and adds the result to the dense vector y, with all operands containing double-precision values.

`func sparse_vector_triangular_solve_dense_double(CBLAS_TRANSPOSE, Double, sparse_matrix_double!, UnsafeMutablePointer<Double>!, sparse_stride) -> sparse_status`

Solves the system of equations x = alpha * T⁻¹ * x for x where x is a dense vector and T is a triangular sparse matrix, with all operands containing double-precision values.

`func sparse_vector_triangular_solve_dense_float(CBLAS_TRANSPOSE, Float, sparse_matrix_float!, UnsafeMutablePointer<Float>!, sparse_stride) -> sparse_status`

Solves the system of equations x = alpha * T⁻¹ * x for x where x is a dense vector and T is a triangular sparse matrix, with all operands containing single-precision values.

`func sparse_permute_rows_double(sparse_matrix_double!, UnsafePointer<sparse_index>!) -> sparse_status`

Permutes the rows of the double-precision sparse matrix A based on the provided permutation array.

`func sparse_permute_rows_float(sparse_matrix_float!, UnsafePointer<sparse_index>!) -> sparse_status`

Permutes the rows of the single-precision sparse matrix A based on the provided permutation array.

`func sparse_permute_cols_double(sparse_matrix_double!, UnsafePointer<sparse_index>!) -> sparse_status`

Permutes the columns of the double-precision sparse matrix A based on the provided permutation array.

`func sparse_permute_cols_float(sparse_matrix_float!, UnsafePointer<sparse_index>!) -> sparse_status`

Permutes the columns of the single-precision sparse matrix A based on the provided permutation array.

`func sparse_elementwise_norm_double(sparse_matrix_double!, sparse_norm) -> Double`

Computes the specified element-wise norm of the double-precision sparse matrix A.

`func sparse_elementwise_norm_float(sparse_matrix_float!, sparse_norm) -> Float`

Computes the specified element-wise norm of the single-precision sparse matrix A.

`func sparse_operator_norm_double(sparse_matrix_double!, sparse_norm) -> Double`

Computes the specified operator norm of the double-precision sparse matrix A.

`func sparse_operator_norm_float(sparse_matrix_float!, sparse_norm) -> Float`

Computes the specified operator norm of the single-precision sparse matrix A.

`func sparse_matrix_trace_double(sparse_matrix_double!, sparse_index) -> Double`

Computes the sum along the specified diagonal of the double-precision sparse matrix A.

`func sparse_matrix_trace_float(sparse_matrix_float!, sparse_index) -> Float`

Computes the sum along the specified diagonal of the single-precision sparse matrix A.