Plot style '--' in 2014b

Question

Stephen Politzer-Ahles 2015-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/169914-plot-style-in-2014b

回答： Spase 2016-6-5

Plot styles like '--' and ':' are no longer working properly for me after I upgraded to 2014b. Specifically, if I plot a vector that has lots of elements, then it still shows up as a solid line even if I specify a different style. For example, this code yields the image following for me, where in the lower subplot you can see that the line looks like a solid line even though it is supposed to be dashed:

figure; hold on;
vectorlengths = [50 500];
titles = {'short vector' 'long vector'};
for i=1:2
  x = linspace(0, 2*pi, vectorlengths(i));
  y1 = sin(x);
  y2 = cos(x);
  subplot(2,1,i); plot(x, [y1;y2], '--', 'LineWidth', 2); title( titles(i) );
end;

It's not quite as simple as that---this problem also is affected by the slope of the line, so for more complicated squiggly lines the style actually changes at different points along the curve, as you can especially see from the green line in the center subplot of this figure and the red line in the left subplot:

What is causing this behavior, and how can I properly control the line styles? What I would like is a dashed line that stays dashed (which is the behavior I got in 2014a and earlier).

Thanks, Steve

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Stephen Politzer-Ahles 2015-1-14

Adam: thanks, I just tried switching to hardware opengl (opengl info indicated that I was using software opengl) and this seems to have fixed it (so far).

Best, Steve

Adam 2015-1-14

That is good then. I will add that as an answer then in case other people come to this thread looking for a solution and don't look at all the comments.

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Answer 1

Adam 2015-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/169914-plot-style-in-2014b#answer_164855

在 MATLAB Online 中打开

Try switching to use hardware opengl using:

opengl( 'hardware' )

(More details in my comment to the original question).

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David Young 2015-1-14

Odd that hardware is OK but software not. It was the other way round for the problem I experienced!

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Answer 2

David Young 2015-1-14

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I think you should contact MathWorks about this. I've also experienced significant problems with plot() in R2014b (in my case with the '.' style), which they said they were aware of.

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Answer 3

Spase 2016-6-5

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https://ww2.mathworks.cn/matlabcentral/answers/169914-plot-style-in-2014b#answer_224501

I have Matlab 2015b on Mac, and opengl( 'hardware' ) didn't make any difference.. I still experience the same problem as Steve. Moreover, seems like in Mac 'hardware' is the only option for OpenGL. Spase