Incorrect graph, loop error?
조회 수: 3 (최근 30일)
이전 댓글 표시
Hello,
I am trying to run a simple malthusian model, however I have run into this error... Does anyone have an idea as to why this is happening? (I am relativly new to MATLAB).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/417333/image.png)
% 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]';
%Malthusian Growth Model
% Time interval
t = (1790:10:2010)';
% Previous population
Pn = [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]';
% Growth Rate Assumption
R = (0.349)';
Labels = [1790:10:2010]';
%Malthusian Model
for i= (2:23)
E(i,1) = (Pn(i-1,1))*(R(1,1)+1)';
end
%PMal(i,1) = (r(1,1)+1)*PMal(i-1,1);
%R2
SST = sum((Pn-mean(Pn)).^2);
SSE = sum((Pn-E).^2);
R2 = 1- (SSE/SST)
% Plot
plot(t,E,'r-*');
hold on
plot (a,b,'bo');
line_color=['r'];
hold off
legend('Malthusian Model','Census Data');
axis([1790 2010 0 500]);
title('US Population Data');
ylabel('Population (Millions)');
댓글 수: 3
Nora Khaled
2020년 11월 18일
I copied your code to try and run it...
the figure looks different
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/417878/image.png)
and I don't understant the model nor the problem
채택된 답변
추가 답변 (0개)
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!