MATLAB: How do i plot the line of best fit

linelinear regressionlineofbestfitplot

So in Pressure Experiments.mat, there is (6,32) data set. I need the whole 5th row and the 6th row of this data.So I made a scatter plot of this data with :
%Load experimental data
load('PressureExperiments.mat', 'PData')
disp(PData)
%Seperating data
A = PData(5,:) %petrol pressure data
B = PData(6,:) %Number of escaping hydrocarbons
figure(1)
scatter(A,B)
How do i make a line of best fit for this? and plot the best line on the same figure?
Thanks

Best Answer

Try this: 
%Load experimental data
load('PressureExperiments.mat', 'PData')
% disp(PData)
%Seperating data
A = PData(5,:); %petrol pressure data
B = PData(6,:); %Number of escaping hydrocarbons
P = polyfit(A, B, 1);                           % Linear Fit
Bfit = polyval(P, A);
figure(1)
scatter(A,B)
hold on
plot(A, Bfit,'-r')
hold off
grid
If you want statistics on the fit, and you have the Statistics and Machine Learning Toolbox, use the regress or fitlm functions.
.
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