Legend for dashed line

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Rose
Rose 2022-7-28
回答： Cris LaPierre 2022-8-1
I have plotted 6 different lines in my figure, 3 solid lines, and 3 dashed lines. When creating a legend however, all lines appear solid. Is there a fix to show the dashed lines (simulated values) as dashed in my legend?
figure(1)
plot(t_measurement,Mx*1000,'-r')
hold on
plot(t_measurement,My*1000, '-b')
plot(t_measurement,-Mz*1000, '-g')
plot(output_time(1:92),output_TB_Mx_BodyFrame(1:92),'--r')
plot(output_time(1:92),output_TB_My_BodyFrame(1:92),'--b')
plot(output_time(1:92),output_TB_Mz_BodyFrame(1:92), '--g')
legend('Measured Mx', 'Measured My', 'Measured Mz', 'Simulated Mx', 'Simulated My', 'Simulated Mz')
yaxis('Bending moment (Nm)')
xaxis('Time (s)')
  6 个评论
显示 4更早的评论
dpb
dpb 2022-7-29
@Walter Roberson -- good thought, but if were so, either
  1. The columns are identical-enough in values all points overlap, or
  2. The additional columns are NaN so don't plot, or
  3. YLIM() has been set so those lines aren't in the visible axis range, and
  4. There must be a total of at least six such columns collectively.
Otherwise, there would be more than the six visible lines in the plot. But, if one of those conditions were true, and the total number of columns >=6, then the symptoms would match.
Adam Danz
Adam Danz 2022-8-1
@Rose, please fill out the "Products" (MATLAB) and "Release" fields on the right of this page.
Also, attach a mat file with the data so we can run this.

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回答（1 个）

Cris LaPierre
Cris LaPierre 2022-8-1
Ran in:
I suspect the issue is that you are missing a 'hold off' and have run your code multiple times. At least I could duplicate by running the first 3 plot commands, and then by running all the plot commands without closing the figure window. It occurred because hold was still 'on'. (I created this plot using dummy data)
It is best practice to always pair a 'hold on' with a corresponding 'hold off'.
% Create dummy data
t_measurement = linspace(0,0.9,10);
output_time = linspace(0,0.9);
output_TB_Mx_BodyFrame = 9e3+700*sin(output_time*40*pi);
output_TB_My_BodyFrame = 4.5e3+500*sin(output_time*40*pi);
output_TB_Mz_BodyFrame = -8e3+500*sin(output_time*40*pi);
Mx = 6+rand(size(t_measurement));
My = 4.5*ones(size(t_measurement));
Mz = 13-3*rand(size(t_measurement));
% Your plotting code (I added a 'hold off', anc change xaxis and yaxis to xlabel and ylabel
figure(1)
plot(t_measurement,Mx*1000,'-r')
hold on
plot(t_measurement,My*1000, '-b')
plot(t_measurement,-Mz*1000, '-g')
plot(output_time(1:92),output_TB_Mx_BodyFrame(1:92),'--r')
plot(output_time(1:92),output_TB_My_BodyFrame(1:92),'--b')
plot(output_time(1:92),output_TB_Mz_BodyFrame(1:92), '--g')
hold off
legend('Measured Mx', 'Measured My', 'Measured Mz', 'Simulated Mx', 'Simulated My', 'Simulated Mz','Location','east')
ylabel('Bending moment (Nm)')
xlabel('Time (s)')

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