Function

Generate a grid based on a functional expression.
The function interpreter uses an expression parser that offers the folowing operators:

+ Addition
- Subtraction
* Multiplication
/ Division
^ power
sin(a)
cos(a)
tan(a)
asin(a)
acos(a)
atan(a)
atan2(a,b)
abs(a)
int(a)
sqrt(a)
int(a)
mod(a,b)
gt(a,b) returns 1 if a greater b
lt(a,b) returns 1 if a lower b
eq(a,b) returns 1 if a equal b
The Variablen are x and y
Example: sin(x*x+y*y)/(x*x+y*y)