clc
clear all
clf
disp('PURPOSE')
disp('  How to plot data in MATLAB')
% INPUTS
% data points to be plotted
xp=[0 1 2 3 4];     % x data points
yp=[0 1 4 9 16];    % y data points
disp('INPUTS')
disp('  Data points to be plotted:')
disp('     x    y')
disp('   ----------')
disp([xp;yp]')
% CODE
% setting up the function to be plotted
xf=[0:0.1:4];       % x domain as a vector
yf=xf.^2;           % y function to be plotted
% plotting the first figure (data points and function)
figure(1)
hold on
plot(xp,yp,'bo','MarkerSize',6)
plot(xf,yf,'r-.','LineWidth',2)
title('\bffunction and data points')
xlabel('values of \itx')
ylabel('values of \ity')
legend('Data points','function, y=x^2',0)
grid on
hold off
% plotting the second figure (only the function)
figure(2)
plot(xf,yf,'k-.','LineWidth',2)
title('\bfy=x^{2}')
xlabel('x points')
ylabel('y points')
grid off
% COMMAND WINDOW OUTPUTS
disp('OUTPUTS')
disp('  See attached plots')