getri#
Computes the inverse of an LU-factored general matrix determined by
getrf. This routine belongs to the oneapi::mkl::lapack namespace.
Description#
The routine computes the inverse inv(A) of a general matrix
A. Before calling this routine, call getrf
to factorize A.
API#
Syntax#
namespace oneapi::mkl::lapack {
void getri(sycl::queue &queue,
int64_t n,
sycl::buffer<T> &a,
int64_t lda,
sycl::buffer<T> &ipiv,
sycl::buffer<T> &scratchpad, int64_t scratchpad_size)
}
getri supports the following precisions and devices:
T |
Devices supported |
|---|---|
|
CPU and GPU |
|
CPU and GPU |
|
CPU and GPU |
|
CPU and GPU |
Input Parameters#
- queue
Device queue where calculations will be performed.
- n
The order of the matrix
A(0 ≤ n).- a
The buffer returned by getrf. Must be of size at least
lda*max(1,n).- lda
The leading dimension of
a(n ≤ lda).- ipiv
Buffer holding the array as returned by getrf. The dimension of the array must be at least
max(1, n).- scratchpad
Pointer to scratchpad memory to be used by the routine for storing intermediate results.
- scratchpad_size
Size of scratchpad memory as a number of floating point elements of type
T. Size should not be less than the value returned by the getri_scratchpad_size function.
Output Parameters#
- a
Overwritten by the n-by-n matrix
A.
Exceptions#
Exception |
Description |
|---|---|
|
This exception is thrown when problems occur during calculations. You can obtain the info code of the problem using the info() method of the exception object: If If |