FORTRAN90 allocatable arrays

Declaration: 
INTEGER, DIMENSION(:), ALLOCATABLE :: ages   ! 1D
REAL, DIMENSION(:,:), ALLOCATABLE :: speed   ! 2D
  • Allocation: 
    READ*, isize
ALLOCATE(ages(isize), STAT=ierr)
IF (ierr /= 0) PRINT*, "ages : Allocation failed"

ALLOCATE(speed(0:isize-1,10),STAT=ierr)
IF (ierr /= 0) PRINT*, "speed : Allocation failed"
  • the optional STAT= field reports on the success of the storage request. If the INTEGER variable ierr is zero the request was successful otherwise it failed. 



Deallocating Arrays






IF (ALLOCATED(ages)) DEALLOCATE(ages,STAT=ierr)

Note: this ALLOCATED() is an intrinic function return a logic value reporting
 the status of the array





































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