ormtr_scratchpad_size#
Computes size of scratchpad memory required for ormtr function.
Description
ormtr_scratchpad_size
supports the following precisions.
T
float
double
Computes the number of elements of type T
the scratchpad memory to be passed to ormtr function should be able to hold.
Calls to this routine must specify the template parameter
explicitly.
ormtr_scratchpad_size#
Syntax
namespace oneapi::mkl::lapack {
template <typename T>
std::int64_t ormtr_scratchpad_size(sycl::queue &queue, oneapi::mkl::side side, oneapi::mkl::uplo upper_lower, oneapi::mkl::transpose trans, std::int64_t m, std::int64_t n, std::int64_t lda, std::int64_t ldc)
}
Input Parameters
In the descriptions below, r
denotes the order of \(Q\):
\(r = m\) |
if |
---|---|
\(r = n\) |
if |
- queue
Device queue where calculations by ormtr function will be performed.
- side
Must be either
side::left
orside::right
.If
side = side::left
, \(Q\) or \(Q^{T}\) is applied to \(C\) from the left.If
side = side::right
, \(Q\) or \(Q^{T}\) is applied to \(C\) from the right.- upper_lower
Must be either
uplo::upper
oruplo::lower
. Uses the sameupper_lower
as supplied to sytrd.- trans
Must be either
transpose::nontrans
ortranspose::trans
.If
trans = transpose::nontrans
, the routine multiplies \(C\) by \(Q\).If
trans = transpose::trans
, the routine multiplies \(C\) by \(Q^{T}\).- m
The number of rows in the matrix \(C\) \((m \ge 0)\).
- n
The number of rows in the matrix \(C\) \((n \ge 0)\).
- lda
The leading dimension of
a
\((\max(1, r) \le \text{lda})\).- ldc
The leading dimension of
c
\((\max(1, n) \le \text{ldc})\).
Return Value
The number of elements of type T
the scratchpad memory to be passed to ormtr function should be able to hold.
Parent topic: LAPACK Singular Value and Eigenvalue Problem Routines