Underflow issue... Again :-(

[mortifyu]

Hi Guru's,

How to get around this resultant underflow issue? I looked around the forum, but did not find the (simple I am sure) answer.

w0= 5
w1=18

w0=w0 - w1 min 0


end

w0 and w1 can and do vary with reference to ADC inputs.

So the desired calculation is that I would like be able to deduct w1 (a potentially higher value than w0) from w0 without the result underflowing below 1 or preferably 0.

I know I could first up say something like:

if w1>w0 then
   w0=0
endif

But... Is there a better way?



Thanks in advance!


Regards,
Mort.

 

[AllyCat]

Hi,

w0 = w0 MIN w1 - w1

Cheers, Alan.

 

[Aries]

w0 = w0 min w1 - w1

will ensure that your result is never "negative".
The min gives a value which is the maximum of w0 and w1. This is never less than w1, and so the result is never less than zero.

 

[mortifyu]

Thank you Gentlemen, most appreciated.

I see you guys are quick to maintain Super-Star status around these parts.



Kind regards,
Mort.