MATLAB: Figure rendered with OpenGL shows distorted data

opengl renderer

Hi,
I'm running MATLAB 7.13.0.564 (R2011b)
I believe the code below illustrates a bug in the OpenGL renderer. The two plots generated contain the same data but the visual results are quite different.
t0=now;N=1e3;y=cumsum(randn(1,N));t=linspace(t0,t0+1,N);figure;plot(t,y);figure;plot(t,y);set(gcf,'renderer','opengl');
The distortion is much less severe when t0 is set to 0 instead of now.
I have a plot containing transparency which needs the OpenGL renderer but it's distorting my data. Can anyone help me with this?
Thank you!

Best Answer

Yes, setting to the OpenGL renderer has problems when the datapoints are close enough together. If you plot(1:length(y),y) you will not see the same problem. But compare
plot((1:1000)/100000000,y)
to
plot((1:1000)/1000000000,y)
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