this is probably a dumb question, but i can't seem to figure out what
function would give me a return of a positive integer whether or not the
result of the equation is pos or neg. in other words, i am producing a data
series that is the slope of a trail (y2-y1)/(x2-x1) where y is elevation in
feet and x is distance in feet. the result of this equation can either
positive or negative depending onwhether the trail is ascending or descending
for that stretch, but i only want the results in positive integers. how is
that done?