ungqr_scratchpad_size

Computes size of scratchpad memory required for ungqr function.

Description

ungqr_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 ungqr function should be able to hold. Calls to this routine must specify the template parameter explicitly.

ungqr_scratchpad_size

Syntax

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

Input Parameters

queue

Device queue where calculations by ungqr function will be performed.

m

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

n

The number of columns the matrix \(A\) (\(0 \le n \le m\)).

k

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

lda

The leading dimension of a.

Return Value

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

Parent topic: LAPACK Linear Equation Routines