Math tools

Function plotting

• PC / Android — Use Wolfram Alpha. For instance:

plot sin(x)/x

Quick and easy but the free version is limited (no zoom or drag).

• PC / Android — Use GeoGebra.

sin(x)/x
g(x)=sin(x)/x

GeoGebra creates function plot as geometric objects, changing color for each function. Note that function can later be moved on the graph, and GeoGebra automatically adapt the algebraic expression

• Android — Use Grapher (2D/3D/history...)

Very handy application. Can handle parametric equation, easy zoom, etc.

• PC — Use iPython/Jupyter:

%matplotlib                    # OR %matplotlib inline in Jupyter
import matplotlib.pyplot as plt
import numpy as np
# http://stackoverflow.com/questions/332289/how-do-you-change-the-size-of-figures-drawn-with-matplotlib
plt.figure(figsize=(20,10)) 
x = np.linspace(0, 3*np.pi, 500)
plt.plot(x, np.sin(x**2))
plt.title('A simple chirp');

• PC — Use Sage

f = lambda t: log( 3659846486 / ((30 - t) * 2^(t/2)) )/log(10)
p1 = plot(f,0,29.9,rgbcolor=hue(0.5))
p1

• PC — Use matplotlib

TBC