global DIMs

I am trying to understand what limitation there may be with the DIM statement.

Any DIMed variables are automatically global.
But it seems as if you can't declare a DIMed variable in a SUBroutine. It seems to act as if it is local to that routine, ie:


CALL MakeArray

FOR I = 1 to 20
Array(I) = I
NEXT I
END

SUB MakeArray
DIM Array(20)
END SUB

causes error:
Runtime Error in program 'untitled': Array(I) = I
Message not understood: #value:

And apparently you can not reDIM a variable in a subroutine and expect to access the increased size of it in the main portion of the program, ie:

DIM Array(10)

CALL MakeArray

FOR I = 1 to 20
Array(I) = I
NEXT I
END

SUB MakeArray
DIM Array(20)
END SUB

causes error:
Runtime Error in program 'untitled': Array(I) = I
Index out of bounds: 11

Vance

Any DIM in the main part of the program creates a global array.
Any DIM inside a procedure (function and sub, not gosub) creates a local array.

I noticed that the REDIM command is missing from the command reference, but it does not change the size of a global array too.