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Foil 6 Fortran90 Arrays and Memory Allocation

From CPS615-Introduction to F90 Features, Rationale for HPF and Problem Architecture Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 24 September 96. by Geoffrey C. Fox *
Secs 128.1
ALLOCATABLE Arrays can be defined at runtime with variable sizing
  • REAL, ALLOCATABLE :: u(:,:) , f(:,:)
  • ALLOCATE ( u(0:nx,0:ny) , f(1:27,0:ny) )
One can define POINTER and TARGET attributes which can be used like REAL, DIMENSION etc.
  • => operator allows one to set a POINTER to "point to" a TARGET
Arguments of a subroutine need NOT define array dimensions in subroutine as these as passed by calling program in data descriptor
Local arrays are created on stack and bounds maybe non constant and evaluated at procedure entry

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