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accessing heap variable elements



Can any one explain this to me?
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IDL> a=ptr_new( lonarr(2) )
IDL> help, a
A               POINTER   = <PtrHeapVar2229>
IDL> help, *a 
<PtrHeapVar2229>
                LONG      = Array[2]
IDL> help, *a[0]
<PtrHeapVar2229>
                LONG      = Array[2]
IDL> help, *a[1]
% Attempt to subscript A with <INT      (       1)> is out of range.
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I would expect that *a[0] and *a[1] would be long integers.  How do I
access the elements in the long integer array heap variable?

Thanks, Jared