If your chosen 2 peaks are X1,Y1 and X2,Y2, then the slope is
=(Y2-Y1)/(X2-X1)
--
David Biddulph

"Lionel Lin" <Lionel wrote in message
...
I have a graph with many peaks which are decreasing and increasing and i
need to get the slope of these peaks ignoring the rest which is below
these peaks.

My graph has many peaks e.g. 50 peaks, each one. What i am trying to do is
draw a line through the top of two peaks and then get the slope of this
line.


Any suggestions?