Hi David,

You may find following threads about macro substitution interesting

- Re: Macro substitution Thread #735756
- Re: Macro Substitution - Epilogue Thread #736706

>Nadya,
>
>Thanks.
>
>Yes, I can. I ended up doing this, since it is probably slightly faster than doing the locate with macro substitution. I was hoping to avoid it though, so that the class didn't have to necessarily know what the index order was.
>But, the main thing I found out here is that indeed, when I use eval() that the expression is no longer Rushmore optimizable. (see Sergey's reply)
>
>Lately, I have been trying to use eval() or name expressions in places where previously, out of force of habit, I used macro substitution in the past. But I am finding that it doesn't always work as I expect, and sometimes I end up breaking my code, or, having the opposite effect that I intended. For example in this case, I thought the eval() would execute faster than the &, but it turned out that the opposite was true.