unmqr_scratchpad_size¶

Computes size of scratchpad memory required for unmqr function.

unmqr_scratchpad_size supports the following precisions.

T

std::complex<float>

std::complex<double>

Description

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

template<typename T> std::int64_t onemkl::lapack::unmqr_scratchpad_size(cl::sycl::queue &queue, onemkl::side left_right, onemkl::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.

left_right

If left_right=onemkl::side::left, Q or Q^H is applied to C from the left.

If left_right=onemkl::side::right, Q or Q^H is applied to C from the right.

trans

If trans=onemkl::transpose::trans, the routine multiplies C by Q.

If trans=onemkl::transpose::conjtrans, the routine multiplies C by Q^H.

m

The number of rows in the matrix A (0≤m).

n

The number of columns the matrix A (0≤n≤m).

k

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

lda

The leading dimension of a.

ldc

The leading dimension of c.

Throws

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

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