Adding variable values into legend

Question

tyler tuokko 2019-3-17

0
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回答： Shubhankar 2023-4-25

Hello, i am looping over different valuesthat effect the plot and i can get a legend that shows how these values relate to the lines shown in the plot. However i would also like to add another legend or something similar that will show some parameters that are manually set in the program.

ie: If gravity would effect the shape of my plot and i set gravity to 10 i would like to be able to have it show on the firgure that "10" was the value of gravity used for run of the plot

thanks

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Answer 1

Star Strider 2019-3-17

4
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There are several ways to do that.

One is:

figure
plot((1:100), rand(1, 100).*sin(1:100))
gravity = 10;
gravstr = sprintf('Gravitational Acceleration is %.1f today',gravity);
legend(gravstr)

Experiment to get the result you want.

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tyler tuokko 2019-3-17

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thanks but i still want to keep the other legend and it wont let me make 2 of them. but i think i found an okay way of doing it by adding a blank subplot, turning the axis off and then adding a text box into the middle of the blank plot.

figure(1)
    
    subplot(1,1,1)
    title('Line Plot of Intensity for all Attenuated Rays')
    xlabel('Y Position of Ray Plot Diagram (Detectors)') 
    ylabel('Relative Intensity') 
    plot(Y,I,'o-','linewidth',1,'markersize',0.1,'markerfacecolor','g');
    
    hold on
    
 
     legend(sprintfc('pol angle %d degrees',polAngSet),'Location','northwestoutside')
     title(legend,'Changing Polerization Angle')
 
      
figure(1)
p1 = subplot(1,3,1);
axis off
ht = text(0, 0.5, { "PARAMETERS"," ", "Number of Rays = "+r, "Lazer Distance = " + dlaser,"Rad Face = " + radFaceSet(1),"h = "+h, "k = "+k}, 'EdgeColor', 'k');

Star Strider 2019-3-17

As always, my pleasure.

I don’t entirely understand what you’re doing.

The legend call wants one plotted object (line, marker, etc.) for each item in it, and will complain if there are more legend items than plotted objects. In that context, the text call is likely your best option. I’ve used an ‘empty’ subplot position for a legend location from time to time, using the 'Position' property to place it.

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Answer 2

Da Bu 2021-4-22

5
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Maybe this code can help you:

x = 1:.1:3; 
colors = jet(5); 
for n = 1:5
    plot(x,sin(x)*n,'color',colors(n,:),'DisplayName',strcat('gravity=',num2str(n)))
    hold on;
end
legend('show')