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Exercise 10 (Plotting)

Plot the datapoints of the following table using plot and colored symbols. Calculate the linear regression using polyfit, and plot the regression line in the same graph. Add title and labels, and export the graphic to a file suitable for inclusion in a text document.
x 0 1 2 3 4 5 6 7 8 9
y -3.1 -0.7 1.8 4.1 6.2 8.9 11.3 13.5 16 18.3

Solution:

>> x=0:9;
>> y=[-3.1,-0.7,1.8,4.1,6.2,8.9,11.3,13.5,16,18.3];
>> plot(x,y,"+r")    % Symbol: o,x,+,*
>> hold
Current plot held.
>> plot(x,polyval(polyfit(x,y,1),x)) % Regression
>> xlabel("x-Achse")
>> ylabel("y-Achse")
>> title("Beispielgraph")
>> print("graph.eps") % not Applet or Midlet!


next up previous contents
Next: Polynomials (1) Up: Plotting Previous: Exercise 9 (Plotting)
Helmut Dersch
2009-03-15