Basic HTML version of Foils prepared 17 Sept 1996

Foil 6 Introduction to Fortran90 Arrays - I

From New CPS615HPF and Fortran90 Discussion Sept 17 96 Basic Simulation Track for Computational Science CPS615 -- Fall Semester 96. by Geoffrey C. Fox, Tom Haupt
1 Arrays are "true" objects in Fortran90 and are stored as values of elements plus a data descriptor!
2 There are operations on full arrays which have natural parallel implementations seen in HPF
3 New set of array intrinsic (built-in) functions for elements, reductions (process array into a single value), tranformational (reshaping)
  • Note these functions are NOT sufficient for real problems and must have FORALL to define new parallel Array functions
  • FORALL is in HPF but not F90 -- Expected in next round of standard (Fortran95)
  • FORALL( I=0:nx)
    • A(i) = (A(I+1)+A(I-1))/(I+1)
  • END FORALL
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© on Tue Oct 7 1997