Parabola plot not displayed correctly
1 view (last 30 days)
Show older comments
I am trying to have a quadratic fit to my data.
X = randi(100,[40, 1])
Y = (2* (X.^2)) +(3*X) +(5);
X2 = [ones(size(X)) X X.^2]
m3 = X2 \ Y;
y3 = X2*m3;
scatter(X,Y);
hold on
plot(X,y3)
ylabel('Y')
title('y= ax^2+bx+c', 'FontSize',18)
hold off;
However, when I display the plot istead of a single parabolic fir I am getting multiple lines.
Please help. I experimented this while learning linear regression.
0 Comments
Accepted Answer
KSSV
on 18 Jul 2019
You are suing the random numbers for demo.....you have to sort them before you use:
X = randi(100,[40, 1]) ;
X = sort(X) ;
Y = (2* (X.^2)) +(3*X) +(5);
X2 = [ones(size(X)) X X.^2]
m3 = X2 \ Y;
y3 = X2*m3;
scatter(X,Y);
hold on
plot(X,y3)
ylabel('Y')
title('y= ax^2+bx+c', 'FontSize',18)
hold off;
More Answers (0)
See Also
Categories
Find more on Statistics and Machine Learning Toolbox in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!