At 05:35 PM 9/6/2004 +0100, you wrote:

>Thanks, I'll take a look.  I think the table approach should be OK, I have a
>good chunk of program memory to play with (18F8620, 64kwords which is
>currently about 55% used).

You could also create a table in terms of the output variable and search 
within
the table for the input, which would take 12 accesses. That's only a 10.5K 
byte
table, with no interpolation required.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




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