MATLAB: ‘legend’ problem

'legend' problem

Hello,

I'm using hold on to draw different vectors on the same graph but every time I add a curve I need to add its legend. My problem is that when I write 'legend('Curve Name')' it appears only the last and I'd need to see all the names together$ on the same legend.

Thank you very much

Silvia

Best Answer

Dear Silva,

The best way is that when you plot give the name to the curve instantly. let say

plot([1:10],'Color','r','DisplayName','Vector 1');hold on;

plot as many vectors you want. Just in end type this.

legend('show');

Related Solutions

MATLAB: How to plot graph scale

figure
plot3([2953500 2955000],[3805000 3805000],[4150000 4150000],'Linewidth',2),hold on
plot3([2955000 2955000],[3805000 3806500],[4150000 4150000],'Linewidth',2) 
plot3([2955000 2955000],[3805000 3805000],[4150000 4152000],'Linewidth',2) 
text(2952800,3805000,4150000,'1km','FontSize',12)
text(2955000,3807000,4150000,'1km','FontSize',12)
text(2955000,3805000,4152500,'1km','FontSize',12)
plot3([2962500 2964000],[3820000 3820000],[4150000 4150000],'Linewidth',2)
plot3([2964000 2964000],[3820000 3821500],[4150000 4150000],'Linewidth',2) 
plot3([2964000 2964000],[3820000 3820000],[4150000 4152000],'Linewidth',2) 
text(2961800,3820000,4150000,'1cm','FontSize',12)
text(2964500,3820000,4150000,'1cm','FontSize',12)
text(2963500,3820000,4153000,'1cm','FontSize',12)
grid on
xlim([2952000 2966000])
ylim([3804000 3822000])
zlim([4150000 4162000])
set(gca,'ydir','reverse');

MATLAB: How to add plots to a legend in a loop

There are multiple ways to add legends to a plot.

1) Set the 'DisplayName' property of each plot. The 'DisplayName' is the string shown in the legend. When you create a legend MATLAB will add all elements that have set the 'DisplayName' property to the legend. Refer to the example below.

t = linspace(0,2*pi,100);
figure;
axes('NextPlot','add');
for freq=1:3
plot( t, cos(freq*t),'DisplayName', ['cos(' num2str(freq) 't)']);
%uncomment if you want to see change each loop
%legend('show')
%pause;
%legend('off')
end
legend('show'); %create/show legend

2) Save the plot handles and legend labels while you loop and add them all to the legend at the end.

t = linspace(0,2*pi,100);
figure;
axes('NextPlot','add');
n=3;
plotHandles = zeros(1,n);
plotLabels = cell(1,n);
for freq=1:n
plotHandles(freq) = plot( t, cos(freq*t) );
plotLabels{freq} = ['cos(' num2str(freq) 't)'];
end
legend(plotHandles, plotLabels);

Best Answer

Related Solutions

MATLAB: How to plot graph scale

MATLAB: How to add plots to a legend in a loop

Related Question