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9.280 UNPACK — Unpack an array of rank one into an array

Description:

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

Standard:

Fortran 95 and later

Class:

Transformational function

Syntax:

RESULT = UNPACK(VECTOR, MASK, FIELD)

Arguments:
VECTORShall be an array of any type and rank one. It shall have at least as many elements as MASK has TRUE values.
MASKShall be an array of type LOGICAL.
FIELDShall be of the same type as VECTOR and have the same shape as MASK.
Return value:

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

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