bill lam wrote: > btw anyone knows how to do it in C or have a pointer? May be this serves as > an > example of "C for J Programmers" :-)
The "C way of doing this" would involve a state machine. Allocate the result array, lay down a zero, update your state machine, lay down a 1, etc. At each state update you increment one index and decrement the other. If that would take you off the edge, you bump the indices again* and reverse the sign of your index delta. *"Bump the indices again" means: Before the half way point: one of the indices has gone below zero -- add one to it. Once you've reached the half way point: one of the indices has gone above its limit value, subtract one from it, and add two to the other index. -- Raul
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