How to plot multiple Loops and draw data lables for legend

Hi

I want to plot return value C and add legend according to iteration for below code

A = [1:4];
B = [1:4];
C = zeros(size(A,2),size(B,2));
for i = 1:length(A)
    for j = 1:length(B)
        C(i,j) = power(A(i),B(j));
    end
end

[KSSV]

Loop not required:

C = (A').^B ; 

How would like to add legend? Do you have any demo picture?

[Life is Wonderful]

@KSSV, Thanks

C = (A').^B ; % It could be ( Not Always) dangerous and may result in Matrix dim mismatch

I welcome your plot proposal

[Life is Wonderful]

You can redraw figure using Base or Exponent as X axis .

I expect legend with base and exponent info

Answer 1

[Shanmukha Voggu]

Hi,

I understood that you want to

1) plot every row of matrix C against matrix B

2) And label every row of matrix C individually using legend

This can be achieved by DisplayName property of the plot as shown below

A = [1:4];
B = [1:4];
C = zeros(size(A,2),size(B,2));
for i = 1:length(A)
    
    for j = 1:length(B)
        C(i,j) = power(A(i),B(j));
    end
    
    plot(B,C(i,:), 'DisplayName', "row - "+num2str(i)); 
    % The DisplayName property is set to the row number of matrix C
    % We can Customize the fourth argument above
    
    if i==1
    hold on % holds the axes such that it contains previous plots and new plots
    end
    
end
hold off % removes the "hold on" constraint
xlabel('Matrix-B');
ylabel('Matrix-C');
legend

Refer to this for more information.

[Life is Wonderful]

@Shanmukha Voggu, Thanks

Makes lot of sense from your plot. May be i missed to explainn expectation in a better way.

I am expecting i and j values in the legend .

Calculated Power using base (i) and expononent (j) test vector.

Example

i = 4;
j = 5;
PowerC =  sprintf (' base_%d_exponent_%d',i,j)

PowerC = ' base_4_exponent_5'

[Shanmukha Voggu]

By using text function, labelling can be done to points

Updating the code provided before

A = [1:4];
B = [1:4];
C = zeros(size(A,2),size(B,2));

for i = 1:length(A)
    
    for j = 1:length(B)
        C(i,j) = power(A(i),B(j));
        text(B(j),C(i,j),"bas-"+num2str(A(i))+",exp-"+num2str(B(j)));
        %adds label to point having x-coordinate as first argument,
        %y-coordinate as second argument and
        %text to be displayed as third argument
                                      
                                                                            
        if i==1 && j==1
            hold on% holds the axes such that it contains previous plots and new plots
         end
    end
    
    plot(B,C(i,:),'*-','DisplayName', "row - "+num2str(i)); 
    % The DisplayName property is set to the row number of matrix C
    % We can Customize the fourth argument above
      
end
hold off % removes the "hold on" constraint
xlabel('Matrix-B');
ylabel('Matrix-C');
legend

[Life is Wonderful]

Thanks ! Nice, apologies for being picky - legend text is overlapping for little bit large value. Could you please suggest non overlap text print method ?

[Shanmukha Voggu]

To avoid text overlapping use annotation as mentioned here.

[Life is Wonderful]

Now I can use your solution in my work.

Thanks a lot for wonderful help!!