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Plot legend does not display any lines

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DoubleD
DoubleD 2019-10-2
评论： Siphiwo Mzekandaba 2023-10-1
Hi,
I am plotting a simple graph from a matrix, but when I code as below, the legend does not show any lines, but shows legend names only.
plot(kmat,v(:,1))
title('Convergence of Value Functions')
xlabel('k')
ylabel('v(k)')
hold on
plot(kmat,v(:,5))
plot(kmat,v(:,50))
plot(kmat,v(:,1000))
legend('iter=1','iter=5','iter=50','iter=1000')
hold off
"kmat" is N x 1 matrix for x-axis value, and "v" is N x N matrix where i want to plot values on y-axis.
However, as you can see from the plot below, the legend displays its names but doesn't display any corresponding line.
legend_problem.png
  13 个评论
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Star Strider
Star Strider 2020-11-17
Paul Stansell —
I have no idea what the problem actually was. I updated the driver (using the ‘Auto-Detect and Install Radeon™ Graphics Drivers for Windows®’ app on the AMD Drivers and Support site) and after that, everything worked as it should, on both my desktop and laptop (both Ryzen+Radeon). There are several posts about this, and in every situation, upgrading the graphics driver solved the problem.
Matthew Fracalanza
Matthew Fracalanza 2021-2-22
编辑：Matthew Fracalanza 2021-2-22
That worked, Star Strider. Thanks so much.

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采纳的回答

darova
darova 2019-10-3
Please see THIS solution for colorbar error

更多回答（4 个）

Benoit Schiltz
Benoit Schiltz 2020-9-16
Hi,
I have the same problem which was solved using
opengl software
But doing that makes the lines of the plot pixelized (this effect was not a problem before) displaying very little stairs between almost each step. Is there a way to fix this? I tried using
opengl hardware
Which solved the problem of the smoothness of the curves but then the legend colors and box disappeared.
Thanks
Paul Stansell
Paul Stansell 2020-11-17
编辑：Paul Stansell 2020-11-17
I have recently had a similar problem. opengl('save','software') did not work for me. Specifying ...'LineWidth',1) did. No idea why! (Actually, a line width >= 0.8 worked)
  5 个评论
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christos d
christos d 2021-1-13
I can confirm that the issue is still there in matlab 2020b. But I can also confirm that using exactly the same laptop in other script it displays the dots of the legend the way it should. The script that I noticed it has the issue, happens to be a function file with nested function that provides results running it directly from the function file. I am not sure if it has to do with the matlab type of file or not, probably not.I do have an AMD processor by the way.
Siphiwo Mzekandaba
Siphiwo Mzekandaba 2023-10-1
I am using R2021a, specifying ...'LineWidth', 1) worked for me.

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Sergio Sanz
Sergio Sanz 2020-4-3
I have the same problem and I've found that it only happens when lines are 0.5 width. If you change to 1 You can see both the edge of the legend and the lines of data inside the legend.
But I don't know what's the problem.
That's only a provisional solution.
  2 个评论
parson fu
parson fu 2020-5-23
I see the same problem too,but in another computer,it works fine.
PAVEL
PAVEL 2022-9-10
It's a really solution, I just want to add it's neccessary to specify 'LineWidth' for each of plots for proper work.

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Aisha Alshamrani
Aisha Alshamrani 2021-3-24
I have the same problem , i try to use opengl but it didn’t work

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