. . .
terminal
. . .
ipython --pylab
x = linspace(- 2 * pi, 2 * pi, 1000)
y = cos(x - pi / 4)
plot(x, y)
xlim(- 2 * pi, 2 * pi)
ylim(- 1.5, 1.5)
xlabel('x')
ylabel('y')
. . . 
save slika.png
