plotting 2 different graphs

i have 2 matrices and want to plot each individual value on a separate graph. like the first value of the first matrix and that of the second matrix only on one graph, then the second values of both on another graph

[Davide Masiello]

Do you mean first row of first matrix vs first row of second matrix etc...?

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

Please post some example data, along with what you tried. I suspect a call to subplot, simple indexing, and two calls to plot will suffice.

Answer 1

[Vinayak Choyyan]

Hello Karelle,

As per my understanding, you have two matrices, say A and B, of the same size. You would like to plot just one (X,Y) pair on a graph for each pair (A(i), B(i)), where i is the index of element in matrix.

From your question, I am not sure whether you would like to have just one figure with multiple subplots for each value pair or have multiple figures with plots for each value pair. Hence I am providing you with a solution for both these mentioned cases.

• One figure with multiple subplots, one subplot for each value pair

a=[1,2,3,4,5;6,7,8,9,10];
b=[2,4,6,8,10;12,14,16,18,20];
%a and b are 2 matrix of same size
sa=size(a);%get the size of a (which is same as b) 
for i=1:sa(1)
    for j=1:sa(2)
        pos=sa(2)*(i-1)+j;%position of current plot in subplot
        subplot(sa(1),sa(2),pos);%select the position of subplot among all the subplots
        plot(a(i,j),b(i,j),'*');
    end
end

• Many figures, one figure for each value pair

a=[1,2,3,4,5;6,7,8,9,10];
b=[2,4,6,8,10;12,14,16,18,20];
%a and b are 2 matrix of same size
sa=size(a);%get the size of a (which is same as b) 
for i=1:sa(1)
    for j=1:sa(2)
        figure;
        plot(a(i,j),b(i,j),'*');
    end
end

I hope this helps resolve the issue you were facing.

Please refer to the following documentation to read more about 'plot()' and 'subplot()' functions:

• plot: 2-D line plot - MATLAB plot - MathWorks India
• subplot: Create axes in tiled positions - MATLAB subplot - MathWorks India

[Karelle Ngwen]

Thank you this was very helpful