http://memorystomp.com/graphtoy/

  Graph Toy Originally by Inigo Quilez (iq/rgba) with some local
  changes.
  Simple on-line graph visualizer


  Render                                                       Graphs                                                 [link] [reset]
  Range:       Size:     [axis] [guides] [grid] [glyphicons]
  [Default  ]  [Small ]                                        [*] f1(x)
                                                               [sin(4*x)/x                                                                ]

                                                               [*] f2(x)
                                                               [floor(x-frac(t))+frac(t)                                                  ]

                                                               [*] f3(x)
                                                               [noise(x)*x                                                                ]

  Sorry, GraphToy cannot start...                              [*] f4(x)
                                                               [2 * abs( floor(x*0.5+0.5) - 0.5*x )                                       ]
  You need a modern browser to run GraphToy
                                                               [ ] f5(x)
                                                               [log(x)                                                                    ]

                                                               [ ] f6(x)
                                                               [-x+sin(x)                                                                 ]

  (-4.73, 8.40)                                        [] []   [ ] f7(x)
                                                               [tri(0.3,x-t*b)                                                            ]

                                                               [ ] f8(x)
                                                               [f7(x) + f7(x*(2+a))*0.5 + f7(x*(4+a))*0.25 + f7(x*(8+a))*0.125            ]




                                                               Constants
                                                               a [0.0     ] [                    ]
                                                               b [0.0     ] [                    ]
                                                               c [0.0     ] [                    ]
                                                               t [0.0     ] [glyphicons] []



                                                               Help
                                                               Formulas:

                                                                 * operators: +, -, *, /, %, ()
                                                                 * trigonometric: cos(x), sin(x), tan(x), acos(x), asin(x), atan(x),
                                                                   atan2(x,y)
                                                                 * exponential: sqrt(x), inversesqrt(x), exp(x), pow(x,y), log(x)
                                                                 * rounding: ceil(x), floor(x), round(x), frac(x)
                                                                 * range: abs(x), sign(x), max(x,y), min(x,y), clamp(x,a,b), step
                                                                   (a,x), smoothstep(a,b,x)
                                                                 * mixing: mix(a,b,x), over(x,y)
                                                                 * signals: tri(a,x), sqr(a,x), noise(x), cellnoise(x), random()
                                                                 * others: radians(degrees), degrees(radians)
                                                                 * constants: PI, E, LN10, LN2, LOG10E, LOG2E, SQRT2, SQRT1_2


                                                               Application:

                                                                 * Pan the graphs with the Left Mouse Button
                                                                 * Zoom into the graphs with Shift + Left Mouse Button
                                                                 * Zoom into the graphs with the Mouse Wheel

                                                               Credits:

                                                                 * Original Graph Toy by Inigo Quilez
                                                                 * Icons by Glyphicons
                                                                 * Report bugs to gar@memorystomp.com or @memorystomp on twitter