% multi_plot.m
% Example for plotting several sets of data on a single graph
% adapted from http://web.cecs.pdx.edu/~gerry/MATLAB/plotting/loadingPlotData.html
% BJ Furman
% 07MAY2012

%  read data into PDXtemperature matrix 
load('PDXtemperature.dat');

%  copy first column of PDXtemperature into month
month = PDXtemperature(:,1);

%  and second column into high_temp
high_temp = PDXtemperature(:,2);

%  and third column into low temp
low_temp = PDXtemperature(:,3);

%  and fourth column into avg temp
avg = PDXtemperature(:,4);

% generate the plot
subplot(2,1,1),plot(month,high_temp,'ko',month,low_temp,'k+');

% add axis labels and plot title
xlabel('Month');                      
ylabel('temperature (degrees F)');
title('Monthly high and low temperature for Portland International Airport');

% generate the Monthly Average Temperature plot
subplot(2,1,2),plot(month,avg,'r-');

% add axis labels and plot titlexlabel('Month');                      
xlabel('Month');                      
ylabel('temperature (degrees F)');
title('Monthly average temperature for Portland International Airport');

%  add a plot legend using labels read from the file
legend('High','Low','Avg');
grid on