Legend for selective plot

Question

klb 2023-4-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1953639-legend-for-selective-plot

评论： klb 2023-4-27

Hello everyone,

I want legend to automatically update based on what was selcted to plot. I want only vectors that are plotted to be indicated within the legend. How do i do that help!

%first column is the counter ID number, and remaining vector are values the counter counted.

my_mat = [11 2 4 5 6;

14 4 5 6 7;

25 2 3 4 5;

56 0 9 8 6]

my_mat = 4×5

11 2 4 5 6 14 4 5 6 7 25 2 3 4 5 56 0 9 8 6

counts = size(my_mat,1);

% Plot only if the the counter ID is amongst the values specified in the if-elseif-else criterion.

for u = 1: size(my_mat,1)

d = my_mat(u);

hold on

if d == 11

plot(1:counts, my_mat(u, 2:end),"LineWidth",1,"Color",'r', "LineStyle","-")

elseif d == 14

plot(1:counts, my_mat(u, 2:end),"LineWidth",1,"Color",'r', "LineStyle","--")

elseif d == 34 % not an error. Counter 25 not in criteria, therefore wont be plotted

plot(1:counts, my_mat(u, 2:end),"LineWidth",1,"Color",'b', "LineStyle","-")

elseif d == 56

plot(1:counts, my_mat(u, 2:end),"LineWidth",1,"Color",'b', "LineStyle","--")

end

legend('11','14','60','56', "Location","southeast") % As seen , the legend is not 'linked' to what is actually plotted. Its hardwired therefore errorprone as shown. I want only vectors that are actually plotted to be indicated within the legend. help!

Warning: Ignoring extra legend entries.

Thank you for your time.