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I know how to use multiple functions. Just put them in square brackets like this

plot3d([x + y, 2x + y], x=-3..3, y=-3..3)

The thing is - I don't know how to create it, where function will depend on x and y. Like if x < 0, it will choose first function. If x > 0, it will use second function. I want to use a functions like these: enter image description here

Danylo Golubtsov
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  • So far I found out about f:=piecewise(...) which allows me to create functions like this. But when I try to implement it to, at least, "implicitplot" function, I just get a fully draw squares, instead of what I need – Danylo Golubtsov Apr 06 '18 at 18:18
  • I don't understand your notation. Are your last two items (eg. x=-1.75 {-2.65<=y<=-2}) meant to denote portions of a plane? Are you just trying to do a 3D plot of portions of cylinder, bounded by planes? I'm sure what you are trying to do is quite possible (and even with smoother bounderies than implicitplot or implicitplot3d would give), but what you've shown is far from clear as an explanation. – acer Apr 10 '18 at 02:38

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