Visible to Intel only — GUID: GUID-38426432-B6B5-4B8E-ADEA-5D1E8E22E113
Visible to Intel only — GUID: GUID-38426432-B6B5-4B8E-ADEA-5D1E8E22E113
?gthrz
Gathers a sparse vector's elements into compressed form, replacing them by zeros.
Syntax
call sgthrz(nz, y, x, indx )
call dgthrz(nz, y, x, indx )
call cgthrz(nz, y, x, indx )
call zgthrz(nz, y, x, indx )
res = gthrz(x, indx, y)
Include Files
- mkl.fi, blas.f90
Description
The ?gthrz routines gather the elements with indices specified by the array indx from a full-storage vector y into compressed form (nz, x, indx) and overwrite the gathered elements of y by zeros. Other elements of y are not referenced or modified (see also ?gthr).
Input Parameters
- nz
-
INTEGER. The number of elements of y to be gathered.
- indx
-
INTEGER. Specifies indices of elements to be gathered.
Array, size at least nz.
- y
-
REAL for sgthrz
DOUBLE PRECISION for dgthrz
COMPLEX for cgthrz
DOUBLE COMPLEX for zgthrz
Array, size at least max(indx(i)).
Output Parameters
- x
-
REAL for sgthrz
DOUBLE PRECISION for dgthrz
COMPLEX for cgthrz
DOUBLE COMPLEX for zgthrz
Array, size at least nz.
Contains the vector converted to the compressed form.
- y
-
The updated vector y.
BLAS 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see BLAS 95 Interface Conventions.
Specific details for the routine gthrz interface are the following:
- x
-
Holds the vector with the number of elements nz.
- indx
-
Holds the vector with the number of elements nz.
- y
-
Holds the vector with the number of elements nz.