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polyfit polynomial coefficiencts--don't understand output
From: |
sameb |
Subject: |
polyfit polynomial coefficiencts--don't understand output |
Date: |
Fri, 14 Oct 2011 16:35:22 -0700 |
Greetings all,
I'm trying to perform a linear regression analysis using polyfit and
polyval. polyfit is not performing the way I expected. Here's a bit of
code...
x = [0,1,2,3,4];
y = x;
[p,s,mu] = polyfit(x,y,1);
[y1,dy] = polyval(p,x,s,mu);
plot(x,y,'o',x,y1,'-')
p
and I'm thoroughly confused of the output p = [1.5,2]
I thought it should be [1,0]. What's wrong? The plot looks correct.
Thanks,
Sam
- polyfit polynomial coefficiencts--don't understand output,
sameb <=