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The abs() function visualized

The abs() function returns the absolute value of a number, it works like this:

cliccie for larger piccie

cliccie for larger piccie

If you are not the most gifted mathematician around  photo clown.gif and you need the some more explanation and/or visualization this vid will do the trick, it explains the concept rather well:

The vid is about 5 minutes long, imho you only need to watch the first two minutes to get it  photo nodding.gif