How to create legend with multiple variables in a loop ?

I want to have a comparison between two plots when a parameter 'M' have different values. I need help in writing the legend properly.

The MATLAB code that i have written is as follows.

%% Input
pro=[1 2 3; 1 2 3;]; % Each row for one value of parameter
rate=[5 10 15;15 20 25;];  % Each row for one value of parameter 
bs=pro; 
bs_rate=[3 8 13;13 18 23;]; % Each row for one value of parameter

%% Plot
for sz = 1:1:2
   figure(1)
    p=plot(pro(sz,:),rate(sz,:),'-p',...
           bs(sz,:),bs_rate(sz,:),'-->');
    xlabel('x-axis') 
    ylabel('y-axis') 
    p(1).LineWidth = 2; p(2).LineWidth = 2;
    hold on
    grid on
    Legend{sz}=strcat('Proposed, M =',num2str(sz),' Benchmark M =', num2str(sz));
    legend(Legend);
end

Answer 1

[Rik]

You should put the figure creation and the creation of the legend outside the loop.

You are merging the two texts, but you should make each a cell element.