%  File:  sin3xPlot.m
%
%  A sample MATLAB script to plot y = sin(3*x) and label the plot

x = 0:pi/30:2*pi;         %  x vector, 0 <= x <= 2*pi, increments of pi/30
y = sin(3*x);             %  vector of y values
plot(x,y)                 %  create the plot
xlabel('x (radians)');    %  label the x-axis
ylabel('sine function');  %  label the y-axis
title('y = sin(3*x)');    %  put a title on the plot