shrink pointer array

shrink_dp_pointer_array.f90

+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