Graph Line at bottom of legend
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Kailin Johnsson
on 17 Nov 2020
Answered: Kailin Johnsson
on 17 Nov 2020
Hi all,
It appears the line which should be plotted is stuck the to bottom of the screen. I have a similar issue in the past, however it was corrected using a '.' in the equation... I have gone through and made sure these have been added hwoever I cannot seem to find the mistake.
% Discrete Logistic Model
% Parameter and intial condtions
clear
clc
Labels2 = [1790:10:1860]';
Labels = [1790:10:2010]';
r= (0.349)
% Carrying Capactiy
M= 330.0
X0= 3.929
p= [2.913 3.929 5.308 7.239 9.638 12.866 17.069 23.191 39.818 50.189 62.947 76.212 92.228 106.021 122.775 132.164 150.697 179.323 203.302 226.545 248.709 281.421 308.745]';
Data = p
A = Data(1:22,1).*(1-(Data(1:22,1)./M));
B = Data(2:23,1)-Data(1:22,1);
X = A\B;
r = X(1,1);
P0 = Data(1,1);
F = zeros(23,1);
F(1,1) = P0
% For loop to generate seqeunce terms
for i=2,23
F(i,1)=F(i-1,1)+r.*F(i-1,1).*(1-(F(i-1,1)./M))';
end
tBegin = 1790; % time begin
tEnd = 2010; % time end
% Time interval
t = (1790:10:2010)';
% Time Interval
a=(1790:10:2010)';
% Population
b= [3.929 5.308 7.239 9.638 12.866 17.069 23.191 31.443 39.818 50.189 62.947 76.212 92.228 106.021 122.775 132.164 150.697 179.323 203.302 226.545 248.709 281.421 308.745]';
% Plot
plot(Labels,Data,'b-*',Labels,F,'r-*');
hold on
legend('Census Data', 'Discrete Logistic Model');
axis([1790 2010 0 500]);
title('US Population Data');
ylabel('Population (Millions)');
%R2
SST = sum((Data-mean(Data)).^2);
SSE = sum((Data-F).^2);
R2 = 1- (SSE/SST)
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