heevd_scratchpad_size

Computes size of scratchpad memory required for heevd function.

Description

heevd_scratchpad_size supports the following precisions.

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

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

heevd_scratchpad_size

Syntax

namespace oneapi::mkl::lapack {
  template <typename T>
  std::int64_t heevd_scratchpad_size(sycl::queue &queue, oneapi::mkl::job jobz, oneapi::mkl::uplo upper_lower, std::int64_t n, std::int64_t lda)
}

Input Parameters

queue

Device queue where calculations by heevd function will be performed.

jobz

Must be job::novec or job::vec.

If jobz = job::novec, then only eigenvalues are computed.

If jobz = job::vec, then eigenvalues and eigenvectors are computed.

upper_lower

Must be uplo::upper or uplo::lower.

If upper_lower = job::upper, a stores the upper triangular part of \(A\).

If upper_lower = job::lower, a stores the lower triangular part of \(A\).

n

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

lda

The leading dimension of a.

Return Value

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

Parent topic: LAPACK Singular Value and Eigenvalue Problem Routines