How can I plot two arrays with different number of columns in one figure with different colours?

Hi all,

If I have two arrays:

A (m,2)  &  B (n,2)  

where n and m are the number of columns in each. let say m=100 and n=4. Both arrays have the same number of rows. I want to plot both arrays in the same figure with different colours.

Thank you

Answer 1

[Evan]

Is this what you mean?

A = [1:100;rand(1,100)]; % random example data
B = [1:4;3*rand(1,4)];
plot(A(1,:),A(2,:),'-g',B(1,:),B(2,:),'-r')

[Abdulatif Alabdulatif]

Thanks for the response.

I am not sure about understanding this:

A(1,:),A(2,:),

I want to plot

plot(A(:,1),A(:,2),'-g',B(:,1),B(:,2),'-r')

However, I want to plot them as a points rather than lines.

Thanks

[Evan]

I think you may have your indexing backwards. MATLAB uses (row,column) indexing.

However, to plot points instead of lines, change the string inputs that fall after the (x,y) data:

plot(A(:,1),A(:,2),'*g',B(:,1),B(:,2),'*r')

See here for more, and click the "LineSpec" dropdown from the "Input Arguments" list.

[Abdulatif Alabdulatif]

Yes, it was my mistake!

Thanks for supporting!

[Evan]

No problem! Glad you got it working.

Answer 2

[Christopher Berry]

MATLAB uses (row,column) indexing, so I think you've got it backwards in your examples A and B :)

But, assuming you want to plot row 1 vs row 2 for A and B, ie y vs x or A(1,:) vs A(2,:), then you can use the plot function with both sets of data and MATLAB will assign different colors automatically:

plot(A(2,:),A(1,:),B(2,:),B(1,:))

And if you want to plot row 2 vs row 1, just switch the order of arguments in the plot function.

You can also see more plot options and examples here:

http://www.mathworks.com/help/matlab/ref/plot.html

[Abdulatif Alabdulatif]

Thanks for supporting!