hegvd_scratchpad

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 3/31/2021

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hegvd_scratchpad_size

Computes size of scratchpad memory required for hegvd (USM Version) function. This routine belongs to the oneapi::mkl::lapack namespace.

Description
API

Description

Computes the number of elements of type T the scratchpad memory to be passed to the hegvd (buffer or USM version) function must be able to hold.

API

Syntax

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

Input Parameters

queue

Device queue where calculations by the hegvd (buffer or USM version) function will be performed.

itype

Must be 1 or 2 or 3. Specifies the problem type to be solved:

if itype= 1, the problem type is A*x = lambda*B*x;

if itype= 2, the problem type is A*B*x = lambda*x;

if itype= 3, the problem type is B*A*x = lambda*x.

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.

uplo

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

If uplo = uplo::upper, a and b store the upper triangular part of A and B.

If uplo = uplo::lower, a and b stores the lower triangular part of A and B.

n

The order of the matrices A and B (0 ≤ n).

lda

The leading dimension of a; at least max(1,n).

ldb

The leading dimension of b; at least max(1,n).

Exceptions

Exception	Description
`mkl::lapack::exception`	This exception is thrown when an incorrect argument value is supplied. You can determine the position of the incorrect argument by the info() method of the exception object.

Return Values

The number of elements of type T the scratchpad memory to be passed to the hegvd (buffer or USM version) function must be able to hold.

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