Computes size of scratchpad memory required for unmrq function.

Description

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

Syntax

namespace oneapi::mkl::lapack {
template <typename T>
std::int64_t unmrq_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)
}


Input Parameters

queue

Device queue where calculations by the unmrq function will be performed.

side

If side = oneapi::mkl::side::left, $$Q$$ or $$Q^T$$ is applied to $$C$$ from the left. If side = oneapi::mkl::side::right, $$Q$$ or $$Q^T$$ 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 in 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 unmrq function should be able to hold.

Parent topic: LAPACK Linear Equation Routines