subroutine shrink_dp_pointer_array(threadinfo, x, new_size)

! resize the input array.
! Author: Douglas Guptill
! Copyright (c) 2009 Douglas Guptill. All rights reserved.
! 2009-07-14: new

use threads
use definitions

implicit none

! parameters, in
integer new_size
type (thread) threadinfo

! parameters, in/out
double precision, dimension(:),pointer::x

! local variables
integer i
double precision, dimension(:),pointer::t

! make a temporary array
allocate  (t(new_size),stat=threadinfo%err)
call heap (threadinfo, 't', 'shrink_dp_pointer_array...', size(t), 'dp', +1)

! transfer the input data to it
do i = 1, new_size
  t(i) = x(i)
enddo

! delete the input array
call heap (threadinfo, 'x', 'shrink_dp_pointer_array...', size(x), 'dp', -1)
deallocate(x)

! re-create the input array, with a new size
allocate  (x(new_size),stat=threadinfo%err)               
call heap (threadinfo, 'x', 'shrink_dp_pointer_array...', size(x), 'dp', +1)

! transfer the data from the temporary array to the new input aray
do i = 1, new_size
  x(i) = t(i)
enddo

! delete the temporary array
call heap (threadinfo, 't', 'shrink_dp_pointer_array...', size(t), 'dp', -1)
deallocate(t)

return
end
