Computes size of scratchpad memory required for the orgqr_batch function.

Description

orgqr_batch_scratchpad_size supports the following precisions.

T

float

double

Group API

Computes the number of elements of type T the scratchpad memory should able to hold to be passed to the Group API of the orgqr_batch function.

Syntax

namespace oneapi::mkl::lapack {
template <typename T>
std::int64_t orgqr_batch_scratchpad_size(cl::sycl::queue &queue, std::int64_t *m, std::int64_t *n, std::int64_t *k, std::int64_t *lda, std::int64_t group_count, std::int64_t *group_sizes)
}


Input Parameters

queue

Device queue where calculations will be performed.

m

Array of group_count $$m_g$$ parameters.

n

Array of group_count $$n_g$$ parameters.

k

Array of group_count kg parameters. The number of elementary reflectors whose product defines the matrices $$Q_i$$ ($$0 \le k_g \le n_g$$).

lda

Array of leading dimensions of $$A_i$$.

group_count

Number of groups of parameters. Must be at least 0.

group_sizes

Array of group_count integers. Array element with index $$g$$ specifies the number of problems to solve for each of the groups of parameters $$g$$. So the total number of problems to solve, batch_size, is a sum of all parameter group sizes.

Return Values

Number of elements of type T the scratchpad memory should able to hold to be passed to the Group API of the orgqr_batch function.

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.

Strided API

Computes the number of elements of type T the scratchpad memory should able to hold to be passed to the Strided API of the orgqr_batch function.

Syntax

namespace oneapi::mkl::lapack {
template <typename T>
std::int64_t orgqr_batch_scratchpad_size(cl::sycl::queue &queue, std::int64_t m, std::int64_t n, std::int64_t k, std::int64_t lda, std::int64_t stride_a, std::int64_t stride_tau, std::int64_t batch_size)
};


Input Parameters

queue

Device queue where calculations will be performed.

m

Number of rows in the matrices $$A_i$$ ($$0 \le m$$).

n

Number of columns in the matrices Ai ($$0 \le n$$).

k

Number of elementary reflectors whose product defines the matrices $$Q_i$$ ($$0 \le k \le n$$).

lda

Leading dimension of $$A_i$$ ($$\text{lda} \le m$$).

stride_a

Stride between the beginnings of matrices $$A_i$$ inside the batch array a.

stride_tau

Stride between the beginnings of arrays $$tau_i$$ inside the array tau.

batch_size

Number of problems in a batch.

Return Values

Number of elements of type T the scratchpad memory should able to hold to be passed to the Strided API of the orgqr_batch function.

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.

Parent topic: LAPACK-like Extensions Routines