unmqr_scratchpad

Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference

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ID 772045

Date 12/16/2022

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unmqr_scratchpad_size

Computes size of scratchpad memory required for unmqr (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 unmqr (buffer or USM version) function must be able to hold.

API

Syntax

namespace oneapi::mkl::lapack {
  template<typename T>
  std::int64_t unmqr_scratchpad_size(sycl::queue &queue,
  mkl::side side,
  mkl::transpose trans,
  std::int64_t m,
  std::int64_t n,
  std::int64_t k,
  std::int64_t lda,
  std::int64_t ldc)
}

Input Parameters

queue

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

side

If side = mkl::side::left, Q or Q^T is applied to C from the left. If side = mkl::side::right, Q or Q^T is applied to C from the right.

trans

If trans=mkl::transpose::trans, the routine multiplies C by Q.

If trans=mkl::transpose::nontrans, the routine multiplies C by Q^T.

m

The number of rows in the matrix A (0 ≤ m).

n

The number of columns in the matrix A (0 ≤ n ≤ m).

k

The number of elementary reflectors whose product defines the matrix Q (0 ≤ k ≤ n).

lda

The leading dimension of a.

ldc

The leading dimension of c.

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 unmqr (buffer or USM version) function must be able to hold.

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Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference

unmqr_scratchpad_size

Description

API