ungqr_scratchpad_size

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(cl::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.

Throws

This routine shall throw the following exceptions if the associated condition is detected. An implementation may throw additional implementation-specific exception(s) in case of error conditions not covered here.

oneapi::mkl::unimplemented

oneapi::mkl::unsupported_device

oneapi::mkl::lapack::invalid_argument

Exception is thrown in case of incorrect supplied argument value. Position of wrong argument can be determined by info() method of exception object.

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