potrs_scratchpad_size

Computes size of scratchpad memory required for potrs function.

potrs_scratchpad_size supports the following precisions.

T
float
double
std::complex<float>
std::complex<double>

Description

Computes the number of elements of type T the scratchpad memory to be passed to potrs function should be able to hold. Calls to this routine must specify the template parameter explicitly.

potrs_scratchpad_size

Syntax

template<typename T>
std::int64_t onemkl::lapack::potrs_scratchpad_size(cl::sycl::queue &queue, onemkl::uplo upper_lower, std::int64_t n, std::int64_t nrhs, std::int64_t lda, std::int64_t ldb)

Input Parameters

queue

Device queue where calculations by potrs function will be performed.

upper_lower

Indicates how the input matrix has been factored:

If upper_lower = onemkl::uplo::upper, the upper triangle U of A is stored, where A = U^T*U for real data, A = U^H*U for complex data.

If upper_lower = onemkl::uplo::lower, the lower triangle L of A is stored, where A = L*L^T for real data, A = L*L^H for complex data.

n

The order of matrix A (0≤n).

nrhs

The number of right-hand sides (0≤nrhs).

lda

The leading dimension of a.

ldb

The leading dimension of b.

Throws

onemkl::lapack::exception

Exception is thrown in case of incorrect argument value is supplied. Position of wrong argument can be determined by get_info() method of exception object.

Return Value

The number of elements of type T the scratchpad memory to be passed to potrs function should be able to hold.

Parent topic: LAPACK Linear Equation Routines