A classic [fractal](https://en.wikipedia.org/wiki/Mandelbrot_set) implemented
entirely in
ExprTK/[Perspective](https://github.com/perspective-dev/perspective). This
example's dataset is just a single column, `"index"`, with 40,000 integers [0,
39999]. From this column, the columns `x` and `y` are derived forming a 200x200
grid, and finally the column `color` is calculated from the standard Mandelbrot
formula, using the complex point at `x + yi`. The controls at the top of the
page allow the programmatic redefinition of this column to e.g. modify the
Mandelbrot function's max iterations, window, resolution, etc.

This examples has no server component and the data is generated in-memory on
load. All calculation is done in the Perspective WebAssembly engine itself.
