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Adding variable values into legend

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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

Accepted Answer

Star Strider
Star Strider on 17 Mar 2019
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.
  2 Comments
tyler tuokko
tyler tuokko on 17 Mar 2019
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
Star Strider on 17 Mar 2019
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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More Answers (2)

Da Bu
Da Bu on 22 Apr 2021
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')
  2 Comments
TANMOY BAIRAGI
TANMOY BAIRAGI on 10 Jan 2022
That's a great technique, thanks a lot.
Michael O'Brien
Michael O'Brien on 13 Mar 2023
you beautiful human being, you x

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Shubhankar
Shubhankar on 25 Apr 2023
Hi Da Bu,
your codes works perfect, but could you be kind enough to give the explanation of legend('show')?
and what exactly you are doing in the plot command?

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