How's this? I had to use a temp register though:

movf   file1,w
subwf  file2,w
btfsc  STATUS, C
goto   $ + 2
movf   file1,w
goto   $ + 1
movf   file2,w
movwf  temp
subwf  file3,w
btfsc  STATUS, C
goto   $ + 2
movf   file3,w
movwf  temp
movf   temp,w

Cheerful regards,
Bob Blick


> Here's a design challenge for you guys:
>
> I have values in three file registers:  fileA, fileB, fileC.
>
> I want to choose the value that's in the middle (numerically) and put it
> into W.
>
> The brute-force way to do this would be to copy the list, sort the
> copy in place, and choose the middle value.
>
> I'm sure there's a more direct way.  Any ideas?
>
> (Application:  This a simple nonlinear filter to remove occasional
> outliers in a sampled data stream.)
>
> Regards,
> Mark
> markrages@gmail


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