How to make the line of best fit go through the origin?
35 views (last 30 days)
Show older comments
Ash Maxwell
on 23 Apr 2020
Commented: Mohd Aaquib Khan
on 13 Sep 2023
Effectivenormalstress=[41,79,119,159,197,80];
Maximumshearstress=[34,73,97,138,173,56];
x=Effectivenormalstress;
y=Maximumshearstress;
scatter(x, y, 'rx');
xlabel('Effective normal stress');
ylabel('Shear stress');
sgtitle('Interpretation for angles of shearing resistance');
coefficients=polyfit(x, y, 1);
xFit=linspace(min(x),max(x),1000);
yFit=polyval(coefficients, xFit);
hold on;
plot(xFit,yFit,'b-' , 'LineWidth',1);
grid on;
0 Comments
Accepted Answer
David Goodmanson
on 23 Apr 2020
Edited: David Goodmanson
on 23 Apr 2020
Hello Ash,
Effectivenormalstress=[41,79,119,159,197,80]'; % make these into column vectors
Maximumshearstress=[34,73,97,138,173,56]';
x=Effectivenormalstress;
y=Maximumshearstress;
c = x\y
xplot = 1:200;
plot(xplot,c*xplot,x,y,'o');grid on
The idea is to fit the linear relation x*c = y in the least squares sense where x and y are column vectors.
1 Comment
Mohd Aaquib Khan
on 13 Sep 2023
Hi David, this is very useful, thanks.
Also how can I find the goodness of fit in this fit? R value or any other goodness of fit parameter!
More Answers (0)
See Also
Categories
Find more on Linear and Nonlinear Regression 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!