Simple way to set y-intercept at zero using polyfit?

I can not seem to find a simple way to to set my y-intercept at 0 using the polyfit function. Here is my syntax so far, please let me know what I should add/change.

fd=polyfit(xfd,fttd,1) %xfd and fttd are both column vectors of length 4 such that xfd=[2;4;6;8] (fttd is a time vector with more complicated numbers)% xfd1=linspace(0,8); fttd1=polyval(fd,xfd1); figure(3) plot(xfd1,fttd1);

Answer 1

[Star Strider]

To the best of my knowledge, polyfit does not allow that. Forcing a zero intercept to a linear regression is straightforward, however:

slope = xfd(:)\fttd(:);

[Jano]

thank you <3

[Star Strider]

My pleasure!

[Jano]

thank you <3

[Ti Miller-Jackson]

Amazing! God bless you @Star Strider!