liebke/incanter — pull request #107 by nbeloglazov (2012-12-11 10:12:20+00:00)
Title: Add parametric function plots

Examples:
Heart
```clojure
(defn heart [t]
[(* 16 (pow (sin t) 3))
(- (* 13 (cos t))
(* 5 (cos (* 2 t)))
(* 2 (cos (* 3 t)))
(cos (* 4 t)))])
(save (parametric-plot heart 0 (* 2 Math/PI)) "heart.png")
```
![heart](https://f.cloud.github.com/assets/252053/5448/1293e4a0-437b-11e2-8e4e-0d4e3d4f6628.png)

Spiral
```clojure
(defn spiral [t]
[(* t (cos t))
(* t (sin t))])
(save (parametric-plot spiral 0 (* 6 Math/PI)) "spiral.png")
```
![spiral](https://f.cloud.github.com/assets/252053/5450/211b9e78-437b-11e2-9334-6004199b3d51.png)

Note: I modified cheat-sheet.tex but didn't generate pdf because I got slightly different pdf when generate on my machine.