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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
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) )
2 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
3 Arguments of a subroutine need NOT define array dimensions in subroutine as these as passed by calling program in data descriptor
4 Local arrays are created on stack and bounds maybe non constant and evaluated at procedure entry
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