How to select legend in multiple subplot?

Question

Fahmy Shandy 2019-12-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/497209-how-to-select-legend-in-multiple-subplot

编辑： Fahmy Shandy 2019-12-18

And Suppose i have 3 programs in one script. I have 4 subplot and each subplot holds 3 graph. In total, so i have 12 graph.

And i'm graphing them in each program instead of at the same paragraph.

For example :

(first program)

subplot(2,2,1)
plot(x,S)
hold on
subplot(2,2,2)
plot(x,E)
subplot(2,2,3)
plot(x,I)
subplot(2,2,4)
plot(x,R)

(second program)

subplot(2,2,1)
plot(x,S)
subplot(2,2,2)
plot(x,E)
subplot(2,2,3)
plot(x,I)
subplot(2,2,4)
plot(x,R)

(third program)

subplot(2,2,1)
plot(x,S)
subplot(2,2,2)
plot(x,E)
subplot(2,2,3)
plot(x,I)
subplot(2,2,4)
plot(x,R)
hold off

And i want to choose two legends.

The first legend is subplot(2,2,2) from the first program.

The second legend is subplot(2,2,2) from the third program.

How can i do this? Please help.

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Answer 1

Ruger28 2019-12-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/497209-how-to-select-legend-in-multiple-subplot#answer_406904

在 MATLAB Online 中打开

Just add the legend line in each "program".

(first program)

subplot(2,2,1)
plot(x,S)
hold on
subplot(2,2,2)
plot(x,E)
legend; % add legend to this subplot
subplot(2,2,3)
plot(x,I)
subplot(2,2,4)
plot(x,R)

(second program)

subplot(2,2,1)
plot(x,S)
subplot(2,2,2)
plot(x,E)
subplot(2,2,3)
plot(x,I)
subplot(2,2,4)
plot(x,R)

(third program)

subplot(2,2,1)
plot(x,S)
subplot(2,2,2)
plot(x,E)
legend; % add legend to this subplot
subplot(2,2,3)
plot(x,I)
subplot(2,2,4)
plot(x,R)
hold off

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Fahmy Shandy 2019-12-18

What i mean "program" in my question is about i have three different case in one script.

I have X as an initial value and then i plot it in the first subplot, then the second program is Y, continuing the X, the second program will plotting to continue the X, and the last one is Z. It's continuing from Y. So in short, as i said before, i have 4 subplot and each subplot has 3 overlapping graphs.

Btw, sorry for my english, but anyway i know you can understand what i mean here.

Fahmy Shandy 2019-12-18

编辑：Fahmy Shandy 2019-12-18

Here is my problem

The legend "pj" must be blue, because i insert legend in the third program. But i don't know how this can be happen. Red color is from the first program that i've mentioned about

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