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Hello Fergus,

I appreciate your help with this! I'll admit that the initial learning curve has been steep for me. It's been so long since I did anything with Polish notation that I'm basically starting over (but I'm learning to appreciate it again, too).

I will study your new example of the cond operator more closely. For right now, here is some code that I think will illustrate the problem I'm having with the reverse operator. And it may either be a bug or just my misunderstanding of how things should work.

set arrayvar ray a1 1 1;
set reversedarray reverse #arrayvar;
dump;
exit;

What I was expecting to see in the dump was reversedarray having the same contents as arrayvar, but in reversed order. Instead, I get this:

    [reversedarray] => Array
        (
            [0] => Array
                (
                    [0] => b2
                    [1] => c3
                    [2] => d4
                    [3] => e5
                    [4] => f6
                    [5] => g7
                    [6] => h8
                )

            [1] => reverse
        )