Gathers a full-storage sparse vector's elements into compressed form.
FORTRAN 77:
call sgthr(nz, y, x, indx )
call dgthr(nz, y, x, indx )
call cgthr(nz, y, x, indx )
call zgthr(nz, y, x, indx )
FORTRAN 95:
res = gthr(x, indx, y)
The ?gthr routines gather the specified elements of a full-storage sparse vector y into compressed form(nz, x, indx). The routines reference only the elements of y whose indices are listed in the array indx:
x(i) = y(indx(i)), for i=1,2,... +nz.
INTEGER. The number of elements of y to be gathered.
INTEGER. Specifies indices of elements to be gathered.
Array, DIMENSION at least nz.
REAL for sgthr
DOUBLE PRECISION for dgthr
COMPLEX for cgthr
DOUBLE COMPLEX for zgthr
Array, DIMENSION at least max(indx(i)).
REAL for sgthr
DOUBLE PRECISION for dgthr
COMPLEX for cgthr
DOUBLE COMPLEX for zgthr
Array, DIMENSION at least nz.
Contains the vector converted to the compressed form.
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 Fortran 95 Interface Conventions.
Specific details for the routine gthr interface are the following:
Holds the vector with the number of elements nz.
Holds the vector with the number of elements nz.
Holds the vector with the number of elements nz.