UNPACK — Unpack an array of rank one into an array

UNPACK()

Store the elements of VECTOR in an array of higher rank.

Parameters

  • VECTOR – Shall be an array of any type and rank one. It shall have at least as many elements as MASK has TRUE values.

  • MASK – Shall be an array of type LOGICAL.

  • FIELD – Shall be of the same type as VECTOR and have the same shape as MASK.

Returns

The resulting array corresponds to FIELD with TRUE elements of MASK replaced by values from VECTOR in array element order.

Standard:

Fortran 90 and later

Class:

Transformational function

Syntax:

RESULT = UNPACK(VECTOR, MASK, FIELD)

Example:

PROGRAM test_unpack
  integer :: vector(2)  = (/1,1/)
  logical :: mask(4)  = (/ .TRUE., .FALSE., .FALSE., .TRUE. /)
  integer :: field(2,2) = 0, unity(2,2)

  ! result: unity matrix
  unity = unpack(vector, reshape(mask, (/2,2/)), field)
END PROGRAM
See also:

PACK, SPREAD