Dear team,

I need to draw linear/exponential trend lines in a Bar chart. Currently, I find NFunctionCalculator class, I think it may help me do this. But I do not know how to write the correct expression or the grammar of the expression. Would you please show me the grammar of the expression?

Another question is how can I draw a fold line in a bar chart? Now I have a series of points with their Y coordinates and their corresponding bar. e.g. Point A: Y=13, and X equals to where bar 3 lies.


Await your early reply!

Thank you in advance!