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From: | Ben Abbott |
Subject: | Re: Plotting Least Squares Regression |
Date: | Fri, 7 Dec 2007 20:59:25 -0500 |
On Dec 7, 2007, at 8:04 PM, Ciaran Mooney wrote:
Evening, I've gotten a bit further with my problem. I have found a forum post[http://forum.mandriva.com/viewtopic.php? t=17602&highlight=&sid=ad0cf06d91bca350253fe355201262ae]that seems to detail what I want to do. I have successfully plotted a graph, and a line of best fit, that to me looks alright. When I type "p" at the prompt to find out what "polyfit(x,y)" has given me I get two values, in the equation y=mx+c, are these values m and c??
CiarĂ¡n, the polyfit/polyval functions for Octave are intended to be consistent with the same in Matlab.
http://www.mathworks.com/access/helpdesk/help/techdoc/index.html?/ access/helpdesk/help/techdoc/ref/polyfit.html&http://www.google.com/ search?q=matlab%20polyfit&sourceid=mozilla2&ie=utf-8&oe=utf-8
Thus is "p" has a length of 2, p(1) = m and p(0) = c.You can fit to polynomials of a larger order using p = polyfit (x,y,N) .... where N = the order of the polynomial.
Thus, the answer to your question is "yes". Provided you meant "polyfit(x,y,1)"
Ben
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