Hi Cindy,

I won't argue with the math since I agree with the definition of a positive and negative slope. However, which pattern is actually "correct" when the description "Upward" and "Downward" diagonal is used and does VFP implement it correctly or does VB?

Anyone have an opinion...

Mike.

>
>From a math article I was able to find, "the slope computed as m = (y2 - y1) / (x2 - x1)." If you set the left-most part of the line at (0, 0) then a lower left to upper right line has a positive slope due to the fact that both the x and y values are increasing, where an upper right to lower left line has a negative slope (y goes from 0 to -something, while x increases). I'd say that a line with a positive slope goes "upward" and a line with a negative slope goes downward.