Polyfit for 0 order polynomial

Ren
2012 12 8
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Dear all,
I am trying to plot a horizontal line (y=b and b is a constant) which is the least-square fitting to a set of data. Is that legit to set 'n' in polyfit as 0, say p = polyfit(x, y, 0) to have a horizontal least square fitting line?
Thanks, Ren

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Matt J
Matt J 2012-12-8
编辑：Matt J 2012-12-8

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It's legitimate, but it's also far simpler to do
p=mean(y);

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