Plotting a Piecewise function?

Hey guys. I need to graph a piecewise function in MATLAB and I don't know how to do it. On top of that, it is also in radians:

f(θ) 
= 
(80/π²) θ, -π/2 ≤ θ ≤ π/2; 
(80/π) - (80/π²) θ, π/2 ≤ θ ≤ 3π/2

How do I graph it in MATLAB? And other than that, is there a way in MATLAB that I can take that function and turn it into time instead of radians? Thanks a lot.

Answer 1

[Matt Fig]

First define this in an M-file:

function [F] = myfunc(thet)
% help
F = zeros(size(thet));
idx = -pi/2 <= thet & thet <=pi/2;
F(idx) = 80*thet(idx)/pi^2;
idx = pi/2 <= thet & thet <=3*pi/2;
F(idx) = 80/pi*(1 - thet(idx)/pi);

Now from the command line:

>> t = linspace(-pi/2,3*pi/2,1000);
>> plot(t,myfunc2(t),'.')