Problem with inserting a line in a surface plot through command

I have a 2D channel flow over a flat plate at the centre of the channel. I want to represent the flat plate by inserting a horizontal line in the surface plots of my results.

When I insert the horizontal line in the surface plot with the command:

a = [0 7.4];
b = [0 0];
line(a,b,'Color','black','LineStyle','-.', 'LineWidth', 5)

some part of the line is not visible, as shown in the figure attached.

But when I insert the line manually from the figure window, then there is no such problem, which I am not able to understand.

I might be missing something obvious.

I would be very thankful if you could provide me some valuable insights.

Thanks in advance.

Answer 1

[Mishaal Aleem]

In your provided code, you set the set the 'LineStyle' to '-.', which is a Dash-dot line line that has gaps. Try changing the 'LineStyle' to '-', which is a Solid line.

a = [0 7.4]; b = [0 0]; line(a,b,'Color','black','LineStyle','-', 'LineWidth', 5)

For more information, please see the Line Style Specifiers documenation.

[Viscous Flow]

The solid line also gave the same problem.

However, I found a solution to this problem in the link: https://fr.mathworks.com/matlabcentral/newsreader/view_thread/284666?requestedDomain=www.mathworks.com

Since I was trying to draw a line in a 3D surface plot, I should use plot3d to overlay a line in the plot.