# ?sctr

Converts compressed sparse vectors into full storage form.

## Syntax

FORTRAN 77:

call ssctr(nz, x, indx, y )

call dsctr(nz, x, indx, y )

call csctr(nz, x, indx, y )

call zsctr(nz, x, indx, y )

Fortran 95:

call sctr(x, indx, y)

## Description

The ?sctr routines scatter the elements of the compressed sparse vector (nz, x, indx) to a full-storage vector y. The routines modify only the elements of y whose indices are listed in the array indx:

`y(indx(i) = x(i)`, for `i=1,2,... +nz`.

## Input Parameters

nz

  INTEGER. The number of elements of x to be scattered.

indx

  INTEGER. Specifies indices of elements to be scattered.

  Array, DIMENSION at least nz.

x

  REAL for ssctr

  DOUBLE PRECISION for dsctr

  COMPLEX for csctr

  DOUBLE COMPLEX for zsctr

  Array, DIMENSION at least nz.

  Contains the vector to be converted to full-storage form.

## Output Parameters

y

  REAL for ssctr

  DOUBLE PRECISION for dsctr

  COMPLEX for csctr

  DOUBLE COMPLEX for zsctr

  Array, DIMENSION at least max(indx(i)).

  Contains the vector y with updated elements.

## Fortran 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 Fortran 95 Interface Conventions.

Specific details for the routine sctr interface are the following:

x

  Holds the vector of length (nz).

indx

  Holds the vector of length (nz).

y

  Holds the vector of length (nz).

Parent topic: Sparse BLAS Level 1 Routines