[Gnuplot-info] How to draw a slop, a tangent, an integrated surface under a function?

[Gelin P. <pat...@fr...>]

Hi,

I'm wondering if it's possible to draw a slop, like this:

      / 
     /
    /\  Here a latex expression...
   /--+---
  /
My function ax+b

An a tangent, and an integrated surface coloried under a function. My
function is an interpolation function...

If gnuplot can't, do you know a product capable with all of this?

Thanks for your help.