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I need some way to calculate x^y (power function) where x is a word variable (0-65535) and y is selection of ( 0.5 , 0.6 , ..., 0.9, 1). Is there a some eficient way to do this,meaning not calculating series or some large tables . Integer result with some marginal error would be fine.
Lookup tables or a series solution maybe the easiest way of calculating it.
You could try an assembler version. Look at this page:
http://www.piclist.com/techref/microchip/math/index.htm
Scroll down to the PICList post "x^y routine implementation" section
Let us know how you get on.
Paul.