I am trying to plot different curves in gui, but i dont know how to add legend to it.

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Ankit Singh 2017-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/333020-i-am-trying-to-plot-different-curves-in-gui-but-i-dont-know-how-to-add-legend-to-it

评论： Rik 2017-4-5

My plots depend on a single variable 's' which i take from the user. I get the plot but am unable to get all the legends for different plots that the user plot for different 's' values. This is the plotting part of the code. where 'i' is a global parameter which increments with each new value of 's'.

   p(i)= plot(x,y,'linewidth',2,'Color',clr(i));
    hold on
    grid on
        title('Rotor Voltage Limit for Various Slip values')
xlabel('P');
ylabel('Q');
 Legend{i}=strcat('S=', num2str(s));
 for l=1:i
 legend([p(1:l)],Legend{1:l})
 end

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Rik 2017-3-31

My first observation is that you don't need the for-loop. The legend function also works if you just enter an array of handles and a cell array. My second observation is that the curly brackets look wrong, as you will not be supplying a cell array as second parameter. I bet you got an error for l==2 (as for l==1 you were just adding a single element legend).

Ankit Singh 2017-4-1

YES! I did get an error for l==2. So what am I supposed to do.

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采纳的回答

Rik 2017-4-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333020-i-am-trying-to-plot-different-curves-in-gui-but-i-dont-know-how-to-add-legend-to-it#answer_261316

在 MATLAB Online 中打开

Try if this works: replace this

for l=1:i
legend([p(1:l)],Legend{1:l})
end

with this

legend(p(1:i),Legend(1:i))

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Ankit Singh 2017-4-4

Sir, I got it! Omg, I was increasing the counter when a new s value was being entered by the user, so the counter was starting from 1+1, 2, instead of 1, and thus all the errors. I feel silly now, to have wasted so much of both of our time. Thank you so much for your help sir. :)