potrs_scratchpad_size

Computes size of scratchpad memory required for potrs function.

Description

potrs_scratchpad_size supports the following precisions.

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

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

namespace oneapi::mkl::lapack {
  template <typename T>
  std::int64_t potrs_scratchpad_size(sycl::queue &queue, oneapi::mkl::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 = oneapi::mkl::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 = oneapi::mkl::uplo::lower, the lower triangle \(L\) of \(A\) is stored, where \(A = LL^{T}\) for real data, \(A = LL^{H}\) for complex data.

n

The order of matrix \(A\) (\(0 \le n\)).

nrhs

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

lda

The leading dimension of a.

ldb

The leading dimension of b.

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