Plotting 2 streamlines on the same plot

4 次查看（过去 30 天）
José Irusta Solera
回答： Ojas 2024-6-20
Hi everyone.
I need to plot 2 different streamlines on the same plot. I was able to do it, but I can't insert a propper legend. My plot code is:
figure
a=streamline(XYe);
hold on
area(circ(1,:),circ(2,:),'FaceColor',Col,'EdgeColor',Col)
hold off
xlabel('x/a [adim.]','FontSize',25)
ylabel('y/a [adim.]','FontSize',25)
set(a,'Color','k')
legend('Stokes','Euler')
But the legend doesn't show the color of the lines correctly (both lines on the legend are blue, the default color of the streamline, and 'Euler' doesn't appear black on the legend, but it does appear black on the plot).
I know the use of set and the figures is not appropiate, and I know this is just a detail, but that's my problem, I want to understand figures, and "set". It would be very helpful if you could help me plot this, and also help me understand the mechanism of figures.
Thanks in advance.
José

请先登录，再回答此问题。

回答（2 个）

Ojas
Ojas 2024-6-20
Hi,
I'm not sure if you could solve your problem, but I discovered the method to solve the problem. You insert "" as many times as the lines are which you do not want in the legend, and then add your actual name in the legend. Attaching the code for the same below. Here, I have the length of the streamlines as 9, hence I inserted my true label once, and then used "" 8 times. Hope this helps.
[startX,startY] = meshgrid(xbins(1:9), zbins(1));
figure(4);
axis equal
lineobj = streamline(X, Z, abs(u'), abs(v'), startX, startY);
for i=1:9
lineobj(i).LineWidth = 2;
end
hold on
A = scatter(x, z, 3, "red", "filled", "o", "MarkerEdgeColor","flat", "MarkerFaceColor","auto" );
hold off
xlabel("X")
ylabel("Z")
title("Streamlines plot")
legend("Force streamlines", "", "", "", "", "", "", "", "", "Particles")
legend('show')
darova
darova 2021-2-9
Use handlers properly
clc,clear
[x,y,z] = peaks(5);
h1 = plot(y,z,'r');
hold on
h2 = plot(y,0.9*z,'b');
hold off
legend('red','blue')
%legend([h1(1) h2(1)],'red','blue')
  3 个评论
显示 1更早的评论
darova
darova 2021-2-10
Try this way:
h = streamline(x,y,u,v,startx,starty);
set(h,'color','r')
José Irusta Solera
José Irusta Solera 2021-2-10
That works on changing the color of the lines on the plot, but the problem is the legend. If I do that, and don't do anything on the legend, then the legend doesn't appear. If I use:
legend('show')
Then the legend shows "Stokes" (or "Euler") lots of times, according to the number of lines there are. I just need it to appear once, like in the image I presented. That's what I can't do.
Thank you.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Legend 的更多信息

标签

产品


版本

R2017b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by