%PROGRAM: HISTOGRAM AND GRAPH TOGETHER

hold on
% this allows you to put more than one
% graph in the same figure

c=round(10*rand(100,1)-5);
% this generates some random numbers

t = -5:.02:5;
% this introduces the variable t.
% t=-5 is the starting value
% t increments in steps of .02 
% until t is 5

hist(c)
% this draws the histogram for c

plot(t, 10*cos(5.5*t)+5,'r')
% this plots the function given
% the 'r' means make it red
% the first t is the variable
% note above we said how often
% we want to sample.
% note: if you zoom in you'll 
% see not graphing smoothly,
% but sampling.

y = -5:2:5;
plot(y, 5*cos(y)+5,'k')
% this plots another function 
% note here I'm sampling every
% 2 units. that's why the cosine
% function doesn't look too good
% the 'k' means blacK. 'b'=blue