Problem in specifying legend in multiple lines and symbols plot

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Raj Arora
Raj Arora 2024 年 4 月 26 日
編集済み: Raj Arora 2024 年 4 月 26 日
I've created a MATLAB script to generate a plot with four lines of different colors and three symbols. Now, I need to add specific legends: the four color lines (green, blue, black, red) should represent the variables stored in `D_cond` as {'Mno','Mot','Mor','Cse'}, and below that the three symbols of black color (pentagon, square, circle) should represent those stored in `C_con` as {'Pr','7 s','10 s'}. Can anyone please help me to get this legends? I have also attached the output as legends what I want as image.
data = xlsread("me.xlsx", "Sheet1",'A:D')
k = figure;
for loop2 = 1:4
values = data(:,loop2);% 5.9413
me = values'
vel_end = 4;
ve1 = 0:vel_end/40:vel_end
xaxis = sort(ve1');
SD = [0.1 0.1 0.1];%[0.0568 0.0719 0.1002];% 0.109];
marker_symbols = {'o', 's', 'p'}; % Add more marker symbols if needed
colors = {[0 0.5 0], [0 0 1], [0 0 0], [1 0 0]}; % Specify colors for each loop iteration
for loop1 = 1:3
for loop = 1:length(ve1) % Change the increment to 20
sink(loop, 1) = (log(xaxis(loop, 1) / me(1, loop1))) / SD(1, loop1);
yaxis1(loop, 1) = normcdf(sink(loop, 1));
end
hold on;
plot(ve1, yaxis1, 'Color',[colors{loop2}], 'Marker', marker_symbols{loop1}, 'MarkerFaceColor', [1 1 1], 'MarkerSize', 6, 'LineWidth', 1.2);
hold on
D_cond = {'Mno','Mot','Mor','Cse'}
C_cond = {'Pr','7 s','10 s'}
hold off
end
end

回答 (1 件)

Lokesh
Lokesh 2024 年 4 月 26 日
Hi Raj,
I understand that you are looking to add a specific legend to your MATLAB plot that combines both color and symbol information. For example, a green line with a pentagon symbol should be labeled 'Mno + Pr', combining elements from two variables, 'D_cond' and 'C_cond'.
Given that an 'Axes' object can only have one legend, a workaround is to arrange the labels in a sequence that mirrors the order of the plotted data, effectively integrating both color and symbol information into each label. This approach ensures that each plot is accurately represented in the legend. Here’s how you can implement this
data = xlsread("me.xlsx", "Sheet1",'A:D');
D_cond = {'Mno', 'Mot', 'Mor', 'Cse'};
C_cond = {'Pr', '7 s', '10 s'};
k = figure;
legendEntries = cell(1, numel(D_cond) * numel(C_cond));%cell array used to store the legend entries for each curve plotted in the loop.
idx=1; % Index to populate legendEntries
for loop2 = 1:4
values = data(:,loop2);
me = values';
vel_end = 4;
ve1 = 0:vel_end/40:vel_end;
xaxis = sort(ve1');
SD = [0.1 0.1 0.1];
marker_symbols = {'o', 's', 'p'};
colors = {[0 0.5 0], [0 0 1], [0 0 0], [1 0 0]};
for loop1 = 1:3
for loop = 1:length(ve1)
sink(loop, 1) = (log(xaxis(loop, 1) / me(1, loop1))) / SD(1, loop1);
yaxis1(loop, 1) = normcdf(sink(loop, 1));
end
hold on;
plot(ve1, yaxis1, 'Color',[colors{loop2}], 'Marker', marker_symbols{loop1}, 'MarkerFaceColor', [1 1 1], 'MarkerSize', 6, 'LineWidth', 1.2);
legendEntries{idx} = [D_cond{loop2}, ' + ', C_cond{loop1}]; % Store legend entry for current curve
idx=idx+1;% Increment index for next legend entry
hold on
hold off
end
end
legend(legendEntries, 'Location', 'best');% Display legend with entries for each curve
%Refer to the attachment for the final plot
Refer to the following documentation for more information on 'legend':
  1 件のコメント
Raj Arora
Raj Arora 2024 年 4 月 26 日
Thank you, Lokesh, but it seems you're not grasping my issue. I simply need four lines, each in a different color, discussing D_cond. Following that, I require three symbols, each in a unique color, representing C_cond. I'm not seeking all possible combinations of twelve lines.

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