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Stumped again on a simple list

Greetings cypherers all,

I make a simple list ii and I find I can make other lists easily by algebraic moves like
jj=ii/2, etc.  But when I want make a new list which splits two different formula, I'm stumped.

Here's a stripped down version to illustrate my problem.  I want to use the value in the original
array to determine how to make the new array.  The If[] is the only thing I can find to make
this decision.  But, it seems I'm not even close when I try:



I've looked around a good bit but have not stumbled into any topic that appears to bear on this problem.

Can I please ask a kind soul to (again) point me in the right direction?

Thanks, Rob

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