Polyfit??????
in [Matlab]
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From: Giga Babs on 9 Mar 2010 05:53 Hya If I wrote : plot(x,y); CoeffReg = polyfit(x(:),y(:),1)'; CoeffReg(1); I got the coefficients of my linear regression in the workspace but I can't see the fit in the figure.... How can I see the fit in the figure??? Thanks
From: Husam Aldahiyat on 9 Mar 2010 05:59 "Giga Babs" <bdmendy(a)gmail.com> wrote in message <hn59af$rfs$1(a)fred.mathworks.com>... > Hya > > If I wrote : > plot(x,y); > CoeffReg = polyfit(x(:),y(:),1)'; > CoeffReg(1); > > I got the coefficients of my linear regression in the workspace but I can't see the fit in the figure.... > How can I see the fit in the figure??? > > Thanks You'll need to plot it yourself. t = linspace(min(x),max(x),100); p = polyval(CoeffReg,t); hold on plot(t,p)
From: Pekka Kumpulainen on 9 Mar 2010 06:03 "Giga Babs" <bdmendy(a)gmail.com> wrote in message <hn59af$rfs$1(a)fred.mathworks.com>... > Hya > > If I wrote : > plot(x,y); > CoeffReg = polyfit(x(:),y(:),1)'; > CoeffReg(1); > > I got the coefficients of my linear regression in the workspace but I can't see the fit in the figure.... > How can I see the fit in the figure??? > > Thanks Read the documentation of polyfit. There is an example.
From: Wayne King on 9 Mar 2010 06:08 "Giga Babs" <bdmendy(a)gmail.com> wrote in message <hn59af$rfs$1(a)fred.mathworks.com>... > Hya > > If I wrote : > plot(x,y); > CoeffReg = polyfit(x(:),y(:),1)'; > CoeffReg(1); > > I got the coefficients of my linear regression in the workspace but I can't see the fit in the figure.... > How can I see the fit in the figure??? > > Thanks You have the coefficients of the polynomial, but you have to construct it as a vector by defining a range of x values and then evaluating the polynomial at those x values. Say your x range from [0,10], create an x vector, x1 x1=0:.01:10; y1 = CoeffReg(1)+CoeffReg(2)*x1; hold on; % to hold your other plot plot(x1,y1,'k') Hope that helps, Wayne
From: Giga Babs on 9 Mar 2010 06:31 "Wayne King" <wmkingty(a)gmail.com> wrote in message <hn5a6i$n43$1(a)fred.mathworks.com>... > "Giga Babs" <bdmendy(a)gmail.com> wrote in message <hn59af$rfs$1(a)fred.mathworks.com>... > > Hya > > > > If I wrote : > > plot(x,y); > > CoeffReg = polyfit(x(:),y(:),1)'; > > CoeffReg(1); > > > > I got the coefficients of my linear regression in the workspace but I can't see the fit in the figure.... > > How can I see the fit in the figure??? > > > > Thanks > > You have the coefficients of the polynomial, but you have to construct it as a vector by defining a range of x values and then evaluating the polynomial at those x values. Say your x range from [0,10], create an x vector, x1 > > x1=0:.01:10; > y1 = CoeffReg(1)+CoeffReg(2)*x1; > hold on; % to hold your other plot > plot(x1,y1,'k') > > Hope that helps, > Wayne Thank you all I got it !!
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