# 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