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unmqr_scratchpad_size

unmqr_scratchpad_size#

Computes size of scratchpad memory required for unmqr function.

Description

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

unmqr_scratchpad_size#

Syntax

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

Input Parameters

queue

Device queue where calculations by unmqr function will be performed.

side

If side=oneapi::mkl::side::left, \(Q\) or \(Q^{H}\) is applied to \(C\) from the left.

If side=oneapi::mkl::side::right, \(Q\) or \(Q^{H}\) is applied to \(C\) from the right.

trans

If trans=oneapi::mkl::transpose::nontrans, the routine multiplies \(C\) by \(Q\).

If trans=oneapi::mkl::transpose::conjtrans, the routine multiplies \(C\) by \(Q^H\).

m

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

n

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

k

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

lda

The leading dimension of a.

ldc

The leading dimension of c.

Return Value

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

Parent topic: LAPACK Linear Equation Routines

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