%-------------------------------------%
% Exercise 7: Bacterial Growth        %
% Date: 10/22/2002                    %
%                                     %
% Gun Srijuntongsiri                  %
% gs61                                %
% ??????                              %
%-------------------------------------%

% Important variables
% -------------------
%   a = number of bacteria in Medium A at each 3 hour interval
%   b = number of bacteria in Medium B at each 3 hour interval
%   x = label of x-axis, i.e. time.

a(1) = 1;
b(1) = 1;
x = 0:3:24;

% Calculate the number of bacteria for each 3 hour interval...
for i=2:9
    a(i) = a(i-1)*8;
    b(i) = b(i-1)*4;
end

% Plot the result
close all             % Close previous figures
plot(x,a,x,b)
xlabel('time (hr)');
ylabel('# of bacteria');
title('xy plot of # of bacteria in mediums after 24 hours');
legend('Medium A','Medium B');
figure
semilogy(x,a,x,b)
xlabel('time (hr)');
ylabel('# of bacteria');
title('linear-log plot of # of bacteria in mediums after 24 hours');
legend('Medium A','Medium B');

%% After 24 hours, number of bacteria in Medium A is much higher
%% than that in Medium B.