Engineering Homework Help

%PROBLEM 7

a=xlsread(‘HW3data (1).xlsx’)

x1 =a(:,4);

x2 =a(:,5)

x3 =a(:,6)

Y =a(:,7);

X=[x1 x2 x3];

mdl2=fitlm(X,y)

b= mdl2.Coefficients.Estimate;

ypred = b(1)+b(2)*x1+b(3)*x2+b(4)*x3;

scatter(x1,x2,x3,’o’,’bl’);

hold on

scatter(x3,x1,x2,’o’,’bl’)

hold on

scatter(x2,x3,x1,’o’,’bl’)

hold on

plot(y,ypred,[65 95],[65,95], ‘r’,”LineWidth”,2);

hold off

legend(“Prediction”,”45 degrees reference”,”Location”,”best”)

ylabel(‘Prediction’)

xlabel(‘Data’)