Using DisplayName Within a Loop

I'm trying to plot multiple different legends to my plot. I'm trying the following code:

col_sim = {'-ro', '-bs', '-*k','-gx'};       % symbols for each curve of the plot (simulated data)
col_exp = {'ro', 'bs', '*k','gx'};           % symbols for each curve of the plot (experimental data)

gap_ratio = [2 3 4 5];    % vector for gap ratios tested


for k=1:n_beta

    txt_sim = ['e/D = ',num2str(gap_ratio(1,k)), '(Simulation)'];
    
    txt_exp = ['e/D = ',num2str(gap_ratio(1,k)), '(de Oliveira Barbosa et al., 2017)'];
    
    plot(Red_V,DataRed_Amplitude_y(:,k),col_sim{k},data_gap2_barbosa_Ay_2D(:,k+i),data_gap2_barbosa_Ay_2D(:,k+i+1),col_exp{k},'DisplayName',txt_sim,'DisplayName',txt_exp) 
    
    hold all
    grid on
    
    legend show
    
    i = i+1;
    
end

And Matlab is plotting the following image:

But all the legends are "(de Oliveira Barbosa et al., 2017)" and what I really want is "(Simulation)" in the first row and "(de Oliveira Barbosa et al., 2017)" in the second row, then again "(Simulation)" in the tirth row and "(de Oliveira Barbosa et al., 2017)" in the forth row and so on.

Can somenone helpe me with this code?

Thank you,

Rafael F.

Answer 1

[Walter Roberson]

You cannot do that in a single call. For plot() the last name/value pair for any given option is the one used for all of the lines created. The linestyle/marker/color arguments that are not name/value pairs are the only ones that are associated with the most recent data only.

[Asad (Mehrzad) Khoddam]

Yes you are right, here is the revised edition:

col_sim = {'-ro', '-bs', '-*k','-gx'};       % symbols for each curve of the plot (simulated data)
col_exp = {'ro', 'bs', '*k','gx'};           % symbols for each curve of the plot (experimental data)

gap_ratio = [2 3 4 5];    % vector for gap ratios tested


for k=1:n_beta

    txt_sim = ['e/D = ',num2str(gap_ratio(1,k)), '(Simulation)'];
    
    txt_exp = ['e/D = ',num2str(gap_ratio(1,k)), '(de Oliveira Barbosa et al., 2017)'];
    if mod(k,3) == 0
        lgnd{k} = txt_sim;
        
    else
        lgnd{k} = txt_exp;
    end
    plot(Red_V,DataRed_Amplitude_y(:,k),col_sim{k},data_gap2_barbosa_Ay_2D(:,k+i),data_gap2_barbosa_Ay_2D(:,k+i+1),col_exp{k}) 
    hold all
    grid on
    
    %legend show
    
    i = i+1;
    
end
legend(lgnd);

[Asad (Mehrzad) Khoddam]

also you can use legend function in every loop as:

https://www.mathworks.com/help/matlab/ref/legend.html

[Rafael Fehér]

Walter Roberson. Thank you for the explanation. I suspected it, and now you have confirmed it to me.

Answer 2

[Asad (Mehrzad) Khoddam]

col_sim = {'-ro', '-bs', '-*k','-gx'};       % symbols for each curve of the plot (simulated data)
col_exp = {'ro', 'bs', '*k','gx'};           % symbols for each curve of the plot (experimental data)

gap_ratio = [2 3 4 5];    % vector for gap ratios tested


for k=1:n_beta

    txt_sim = ['e/D = ',num2str(gap_ratio(1,k)), '(Simulation)'];
    
    txt_exp = ['e/D = ',num2str(gap_ratio(1,k)), '(de Oliveira Barbosa et al., 2017)'];
    if mod(k,3) == 0
        plot(Red_V,DataRed_Amplitude_y(:,k),col_sim{k},data_gap2_barbosa_Ay_2D(:,k+i),data_gap2_barbosa_Ay_2D(:,k+i+1),col_exp{k},'DisplayName',txt_sim) 
    else
        plot(Red_V,DataRed_Amplitude_y(:,k),col_sim{k},data_gap2_barbosa_Ay_2D(:,k+i),data_gap2_barbosa_Ay_2D(:,k+i+1),col_exp{k},'DisplayName',txt_exp) 
    end
    hold all
    grid on
    
    legend show
    
    i = i+1;
    
end