ungtr_scratchpad_size

Computes size of scratchpad memory required for ungtr function.

Description

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

ungtr_scratchpad_size

Syntax

namespace oneapi::mkl::lapack {
  template <typename T>
  std::int64_t ungtr_scratchpad_size(sycl::queue &queue, oneapi::mkl::uplo upper_lower, std::int64_t n, std::int64_t lda)
}

Input Parameters

queue

Device queue where calculations by ungtr function will be performed.

upper_lower

Must be uplo::upper or uplo::lower. Uses the same upper_lower as supplied to hetrd.

n

The order of the matrix \(Q\) \((0 \le n)\).

lda

The leading dimension of a \((n \le lda)\).

Return Value

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

Parent topic: LAPACK Singular Value and Eigenvalue Problem Routines