Legend Problems with Graph

Question

Hamish Brown 2021-1-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/727683-legend-problems-with-graph

评论： Star Strider 2021-1-26

I am attempting to plot three data lines on a graph, 'Critical Flow','Sub Critical Flow' and 'Super Critical Flow'. When i add the legend onto the graph, it seems to think that Sub Critical FLow and Super Critical flow are the same thing and doesnt add the correct legend to the graph. I then tried to fix this by adding 'DisplayName' to the graph and then it seemed to think that each individual point is a seperate plot (image attached). I tried plotting a similar graph with a different variable and it worked fine.

figure(6) %corresponds to bottom graph
clf
hold on
plot(pos01,Umeasured1,'k-o','MarkerSize',4);
plot(pos02,Umeasured2,'b-s','MarkerSize',4);
plot(pos03,Umeasured3,'r-d','MarkerSize',4);
legend('Critical','SubCritical','SuperCritical','Location','SW')
xlabel('y ordinate (mm)');
ylabel('Wake Velocity u/U\infty');
grid minor
hold off
figure(6) %corresponds to top graph
clf
hold on
plot(pos01,Umeasured1,'k-o','MarkerSize',4,'DisplayName','Critical');
plot(pos02,Umeasured2,'b-s','MarkerSize',4,'DisplayName','SubCritical');
plot(pos03,Umeasured3,'r-d','MarkerSize',4,'DisplayName','SuperCritical');
legend('show')
xlabel('y ordinate (mm)');
ylabel('Wake Velocity u/U\infty');
grid minor
hold off

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Answer 1

Star Strider 2021-1-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/727683-legend-problems-with-graph#answer_606803

在 MATLAB Online 中打开

Try something like this:

figure(6) %corresponds to bottom graph
% clf
hold on
h1 = plot(pos01,Umeasured1,'k-o','MarkerSize',4);
h2 = plot(pos02,Umeasured2,'b-s','MarkerSize',4);
h3 = plot(pos03,Umeasured3,'r-d','MarkerSize',4);
legend([h1(1),h2(1),h3(1)], 'Critical','SubCritical','SuperCritical','Location','SW')
xlabel('y ordinate (mm)');
ylabel('Wake Velocity u/U\infty');
grid minor
hold off