Feature request: Plotting complex number functions

[withjak]

Clojure functions to plot functions with complex input and complex output.

For each function there should be two 2-D plots. One showing the inputs. And another showing the outputs. This is sometimes referred to as z-w planes method.

It would be helpful to see what transformations are happening if we carefully select the inputs to be points on grid lines. Probably providing each line a distinct color

## Example inputs:
# parallel to x-axis
(0, 0), (1, 0), (2, 0), (3, 0), (4, 0), (5, 0), (6, 0), (7, 0), (8, 0), (9, 0)
(0, 1), (1, 1), (2, 1), (3, 1), (4, 1), (5, 1), (6, 1), (7, 1), (8, 1), (9, 1)
(0, 2), (1, 2), (2, 2), (3, 2), (4, 2), (5, 2), (6, 2), (7, 2), (8, 2), (9, 2)

# parallel to y-axis
line x = 0 
line x = 1
line x = 2

More details here: Complex Functions as Mappings

@sritchie Your initial try Error: complex is not defined

Maybe for later investigations:
Another interesting visualisation technique
Plot on 3-D Cartesian coordinate system only three variables out of the below 4 variables:
Re(input), Im(input), Re(output), Im(output)
Visualizing Complex Functions
More on this later once i actually understand it.