Combine legends of two plots (Two plots are in a for loop)

Question

Karthik Brs 2015-11-4

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评论： Karthik Brs 2015-11-4

myVariable.mat

Hello everyone, I have a small problem here. I am suppose to combine two legends from two plots which are in a 'for' loop. Whenever I try to combine two legends, only one gets printed or I get a error! In other words, I just to add the legend with the name 'TOTAL' to the legend of the first plot! I am enclosing my code and variables with this query if you like to give it a try. Thank you in advance!

         for y1=1:1:ordn
            while feof(fid) == 0
                tline = fgetl(fid);
                n1=n1+1;
                if n1 == line(y1) + 4
                    c = strsplit(tline,',');
                    ord(y1).dat = fscanf(fid, '   %f,    %f,    %f,    %f,    %f,    %f', [6, diffr(y1)]);
                    ord(y1).freq = transpose(ord(y1).dat(1,:));
                    ord(y1).rpm = ord(y1).freq/ord1(y1)*60;
                    RPM{y1} = ord(y1).rpm;
                    ord(y1).total_lw = transpose(ord(y1).dat(2,:));
                    ord(y1).lw = transpose(ord(y1).dat(3,:));
                    ord(y1).lw2 = transpose(ord(y1).dat(4,:));
                    ord(y1).lw3 = transpose(ord(y1).dat(5,:));
                    ord(y1).lw4 = transpose(ord(y1).dat(6,:));
                    x = ord(y1).freq; r = ord(y1).rpm; f = ord(y1).freq;
                    z1 = ord(y1).lw; z2 = ord(y1).lw2; z3 = ord(y1).lw3;
                    z5 = ord(y1).total_lw; z4 = ord(y1).lw4;
                    figure(20);
                    plot(r,z5,'color',C{y1},'Linewidth',2);
                    hold on
                    title(sprintf('%s for the Total Time Orders',Method),'FontSize',16,'Fontweight','bold');
                    grid on;
                    xlabel('RPM','FontSize',12,'Fontweight','bold');
                    ylabel('Schallleistung dB','FontSize',12,'Fontweight','bold');
                    legendInfo{y1} = ['Total Time order ' num2str(ord1(y1))];
                    li = legend(legendInfo,'location','southeast');
         end        
         for s=1:1:length(tempLw)
                                div{s} = tempLw{1,s}./10;
                                raise10{s} = 10.^div{s};
                                LwSum = LwSum + raise10{1,s};
                                LwlogSum = 10*log10(LwSum);
         end
         p1 = plot(a1,LwlogSum,'k','Linewidth',1.5);
         ki = legend('TOTAL','location','northeast');
         %legend(li,ki);
         hold off;

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Answer 1

Thorsten 2015-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/252674-combine-legends-of-two-plots-two-plots-are-in-a-for-loop#answer_198407

在 MATLAB Online 中打开

You cannot "add" an entry to an existing legend, as far as I know. But you can create handles for you plots and concatenate the handles to create a handle for the legend that contains all plots:

 R = rand(4);
 h = plot(R)
 legend(h, '1', '2', '3', '4')
 hold on
 h2 = plot(mean(R), 'k', 'LineWidth', 2)
 legend([h; h2], '1', '2', '3', '4', 'Total')

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Thorsten 2015-11-4

在 MATLAB Online 中打开

R = rand(4);
legendtext = {'1', '2', '3', '4'};
for i = 1:size(R,1)
 h(i) = plot(R(i,:));
 legend(h, legendtext(1:i))
 if ~ishold, hold on, end
 pause
end
fulllegendtext = legendtext;
fulllegendtext{end+1} = 'Total';
h2 = plot(mean(R), 'k', 'LineWidth', 2);
legend([h h2], fulllegendtext)