VecGetArrayReadF90

Accesses a read only array from Fortran. For default PETSc vectors, VecGetArrayF90() returns a pointer to the local data array. Otherwise, this routine is implementation dependent. You MUST call VecRestoreArrayReadF90() when you no longer need access to the array.

Synopsis

VecGetArrayReadF90(Vec x,{Scalar, pointer :: xx_v(:)},integer ierr)

Logically Collective

Input Parameter

• x - vector

Output Parameters

• xx_v - the Fortran pointer to the array

• ierr - error code

Example of Usage

#include <petsc/finclude/petscvec.h>
    use petscvec

    PetscScalar, pointer :: xx_v(:)
    ....
    call VecGetArrayReadF90(x,xx_v,ierr)
    a = xx_v(3)
    call VecRestoreArrayReadF90(x,xx_v,ierr)

Note

If you intend to write entries into the array you must use VecGetArrayF90().

See Also

Vectors and Parallel Data, Vec, VecRestoreArrayReadF90(), VecGetArray(), VecRestoreArray(), VecGetArrayRead(), VecRestoreArrayRead(), VecGetArrayF90()

Level

beginner

Location

src/vec/vec/interface/rvector.c

Examples

src/ts/tutorials/ex22f_mf.F90
src/snes/tutorials/ex73f90t.F90
src/snes/tutorials/ex1f.F90
src/tao/leastsquares/tutorials/chwirut2f.F90
src/ts/tutorials/ex1f.F90
src/ts/tutorials/ex22f.F90
src/tao/unconstrained/tutorials/eptorsion2f.F90
src/tao/unconstrained/tutorials/rosenbrock1f.F90
src/ksp/ksp/tutorials/ex14f.F90

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