How could I use Legend function in a for loop with an array?

Question

Jose Peñaloza 2015-10-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/248805-how-could-i-use-legend-function-in-a-for-loop-with-an-array

评论： Jose Peñaloza 2015-10-20

Hi! everyone I am trying to insert a Legend in a plot with different names but in a sequence. The problem basically is when I plot Legend, it only show me the first or the last filename I require. So I hope you can help me because I tried with different methodologies and it doesn't work. My code is the next:

          for k=1:numfiles
                figure(2)                                           
                legend(filename(k));
                plot3(f{1,k}'/1000,((k*10^2)*10^6)+Ejey{1,k},2*q_magC{1,k},(colour(k)))
                title('TRANSFORMADA DE FOURIER')
                xlabel('  Frecuencia (kHz)   ')
                zlabel('  Magnitud   ')
                view(40,35)
                grid on
                hold all
           end

Thanks in advance!

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Geoff Hayes 2015-10-17

Jose - if I do something similar and create the legend outside of the loop (or even as you have shown above within at each iteration of the loop), then all of the filenames appear as expected as legend entries. Can you show us what the filename variable is initialized to? How many curves are being drawn on your figure?

Jose Peñaloza 2015-10-20

编辑：Jose Peñaloza 2015-10-20

在 MATLAB Online 中打开

Thank you! finally I did it, the code that let me:

for k=1:numfiles
                figure(2)
                leyenda=filename(1:k)
                legend(leyenda)
                plot3(f{1,k}'/1000,((k*10^2)*10^6)+Ejey{1,k},2*q_mag{1,k},(colour(k)))
                xlim ([0 25])
                title('TRANSFORMADA DE FOURIER')
                xlabel('  Frecuencia (kHz)   ')
                zlabel('  Magnitud   ')
                view(40,35)
                grid on
                hold on
           end

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Answer 1

Stalin Samuel 2015-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/248805-how-could-i-use-legend-function-in-a-for-loop-with-an-array#answer_196307

在 MATLAB Online 中打开

%try like this
s = {'L1','L2','L3'};
for i = 1:length(s)
    plot(rand(10,1),'color',rand(1,3));
    hold on
end
legend(s)

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Jose Peñaloza 2015-10-20

在 MATLAB Online 中打开

Thank you for your help! Finally I did it with that code

for k=1:numfiles
                figure(2)
                leyenda=filename(1:k)
                legend(leyenda)
                plot3(f{1,k}'/1000,((k*10^2)*10^6)+Ejey{1,k},2*q_mag{1,k},(colour(k)))
                xlim ([0 25])
                title('TRANSFORMADA DE FOURIER')
                xlabel('  Frecuencia (kHz)   ')
                zlabel('  Magnitud   ')
                view(40,35)
                grid on
                hold on
           end