Draw a function!

[Tugdual]

Okay, now that I have access to a PC I could finally try this feature.
Experience is very poor with the mouse: for some reasons it is extremely slow and it is difficult to draw something smoothly.

Now I'm confused again with the Prime market. It is clear that it is for students and not engineers but to me this tool is really targeting young children while the Prime is way too advanced and expensive for such an audience.