multiple_linear_regression - P=Z\oxy; fprintf('\no = %10.8f...

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function multiple_linear_regression(T,o1,o2,o3,cg,tg,tv) %Problem 14.6 % %T=temperature in degrees Celsius %cg=given concentration along with tg=given temp, from these values, calc %dissolved oxygen and percent error. True value of dissolved oxygen is %passed into funciton by tv. % %p=polyfit(x,y,n) % x=independent variable % y=dependent variable % n=the order of the polynomial Ttotal=[T; T; T]; oxy=[o1; o2; o3]; c=[zeros(7,1); linspace(10,10,7)' ;linspace(20,20,7)']; Z=[ones(size(Ttotal)) Ttotal c];
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Unformatted text preview: P=Z\oxy; fprintf('\no = %10.8f + %9.8fT + %9.8fc\n\n',P(1),P(2),P(3)); %--------------------------------------------------------------------------y=P(1)+P(2).*Ttotal+P(3).*c; n=size(y); A=[ones(n) oxy]; reg=A\y; o2=linspace(min(oxy),max(oxy),2); rfit=reg(1)+reg(2)*o2; plot(oxy,y,'o',o2,rfit); title('Polynomial regression'); %percent relative error y=P(1)+P(2)*tg+P(3)*cg; perr=abs((y-tv)/y)*100; fprintf('At T=%2d and c=%2dC, the predicted value of o is %8.7f\nPercent relative error=%5.4fpercent\n\n',tg,cg,y,perr);...
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This note was uploaded on 09/27/2011 for the course EGM 3344 taught by Professor Raphaelhaftka during the Spring '09 term at University of Florida.

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multiple_linear_regression - P=Z\oxy; fprintf('\no = %10.8f...

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