how to plot two matrices in the same window in matlab in different graphs and colors?

Question

figure;
plot(trainingSet(:, 1), trainingSet(:, 2), '*');
figure;
plot(reprVectors(:, 1), reprVectors(:, 2), '*');

How do I plot the points from trainingSet and reprVectors in same figure instead of 2 different ones?

Also How can I make trainingSet pts blue and reprVectors points red?

Answer 1

What you describe is the subplot function: same figure, different plot axes

eg:

c=-2:0.1:2;
figure
subplot(121)
plot(x,x);
subplot(122)
plot(x,x.^2)

This plots the function y=x and y=x^2 in one figure, but next to eachother.

The red/blue and marker options are already explained in other answers :)

Answer 2

I would do it with the MATLAB Hold Function

The syntax would be:

figurel
plot(trainingSet(:, 1), trainingSet(:, 2), '*');
hold on
plot(reprVectors(:, 1), reprVectors(:, 2), '*');
hold off

Hope that helps

Answer 3

If you replace the second figure by hold on, they will be plotted together. You can add color identifiers to the marker, for example plot(....,...,'r*') will plot red stars and 'bo' plots blue circles. The available shapes and colors are described here.