qr_space Interface
-
- experimental
- 22 statements
- Source File
public interface qr_space
Computes the working array space required by the QR factorization solver (Specification)
Description
This interface returns the size of the real or complex working storage required by the
QR factorization solver. The working size only depends on the kind (real or complex) and size of
the matrix being factorized. Storage size can be used to pre-allocate a working array in case several
repeated QR factorizations to a same-size matrix are sought. If pre-allocated working arrays
are provided, no internal allocations will take place during the factorization.
Subroutines
private pure module subroutine get_qr_c_workspace(a, lwork, err)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| complex(kind=sp), | intent(in), | target | :: | a(:,:) |
Input matrix a[m,n] |
|
| integer(kind=ilp), | intent(out) | :: | lwork |
Minimum workspace size for both operations |
||
| type(linalg_state_type), | intent(out), | optional | :: | err |
State return flag. Returns an error if the query failed |
private pure module subroutine get_qr_d_workspace(a, lwork, err)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real(kind=dp), | intent(in), | target | :: | a(:,:) |
Input matrix a[m,n] |
|
| integer(kind=ilp), | intent(out) | :: | lwork |
Minimum workspace size for both operations |
||
| type(linalg_state_type), | intent(out), | optional | :: | err |
State return flag. Returns an error if the query failed |
private pure module subroutine get_qr_s_workspace(a, lwork, err)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real(kind=sp), | intent(in), | target | :: | a(:,:) |
Input matrix a[m,n] |
|
| integer(kind=ilp), | intent(out) | :: | lwork |
Minimum workspace size for both operations |
||
| type(linalg_state_type), | intent(out), | optional | :: | err |
State return flag. Returns an error if the query failed |
private pure module subroutine get_qr_z_workspace(a, lwork, err)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| complex(kind=dp), | intent(in), | target | :: | a(:,:) |
Input matrix a[m,n] |
|
| integer(kind=ilp), | intent(out) | :: | lwork |
Minimum workspace size for both operations |
||
| type(linalg_state_type), | intent(out), | optional | :: | err |
State return flag. Returns an error if the query failed |