### 3.2.3 3-d graph with rainbow colors

`plotfunc` represents a pure imaginary expression `i*E`
of two variables with a rainbow color depending
on the value of `z=E`. This gives an easy way to
find points having the same third coordinate.

The first arguments of `plotfunc` must be `i*E` instead of `E`,
the remaining arguments are the same
as for a real 3-d graph (cf 3.2.2)
Input :

`plotfunc(i*x*sin(y),[x=0..2,y=-pi..pi]) `

Output :

`A piece of the surface `*z*=*x**`sin``(`*y*)` with rainbow colors`

**Remark**

If you want the impression or the traduction Latex, you have to use :

`Menu``▸``print``▸``Print(with Latex)`.