Why don't my stem graph vertical lines appear?

Hello! I'm currently facing a problem using Matlab r2015a. When I draw a stem graph, the lines that are supposed to connect the points and the horizontal axis, do not appear. How can I make them appear? Thank you for your time.

[Kevin Claytor]

Can you give us an example of your code?

[Nuno Fernandes]

Well, it's just a normal plot of a graphic. Something like:

x = linspace(-2*pi,2*pi,100); 
y = 4*pi*randn(1,100)-2*pi; 
figure;
subplot(2,1,1), plot(x,y,'-r.')  
subplot(2,1,2), stem(x,y)

[Abubakar Essel]

Type opengl('save','software') at the MATLAB command prompt. Then, restart MATLAB.

Answer 1

[Image Analyst]

It worked for me. I get vertical lines. Try this, changing the 'LineWidth' property:

x = linspace(-2*pi,2*pi,100); 
y = 4*pi*randn(1,100)-2*pi; 
figure;
subplot(2,1,1);
plot(x,y,'-r.')  
grid on;
subplot(2,1,2);
stem(x,y, 'LineWidth', 3)
grid on;
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Stem Test', 'NumberTitle', 'Off')

[Nuno Fernandes]

Well, it shows now. Thank you so much. I just have one question. Will I always have to set the linewidth? In all of my colleagues' PCs, the lines appear without having to do this.

[Walter Roberson]

I seem to remember that with R2015a, displaying to an axes that was too small could result in narrow lines effectively vanishing, because the interpolation to a smaller number of pixels might decide they don't contribute enough to show up. That might have been related to anti-aliasing. If so then see if

set(gcf, 'graphicssmoothing', 'off')

makes a difference.

I think they changed the underlying issue for R2015b.

I am not certain on this matter; I could be mis-remembering something I read in the fall.

[Nuno Fernandes]

Unfortunetely it didn't work. Thank you anyway :)

Edit: I made it work. I just changed the anti-aliasing settings on my AMD Catalyst Control Center (GPU drivers).

[infotech]

How changes can be made in anti-aliasing settings on AMD Catalyst Control Center (GPU drivers)