When making plots I always get white pixels/ artifacts in the plot, and I would like to avoid this. (Unfortunately I cannot reproduce this issue on other machines.) What could I do?
MATLAB: How to avoid white artifacts in the plots
artifactsfigureMATLABpainterspixelplotwhite
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Ok, I have determined the issue here. mmpolar attempts to highlight the structure in the data by setting the RLimits to [min(rho) max(rho)]. This is why it looks as though the data went to zero on the plot when in reality it did not. By explicitly setting the RLimits the plot comes out correct.
I think I might know what you're referring to.
I'm guessing that you're using a version of MATLAB which is older than R2014b. For example, if I run your code in R2014a, and turn off the axes:
axis offI get something that looks like this:
The rendering pipeline we used in earlier versions of MATLAB rounded coordinates to the nearest pixel, and in this case, the Y values 0 and 1e-15 map to adjacent pixels. This means that you see a ripple effect as the line oscillates between those two different rows of pixels.
We overhauled the rendering pipeline in R2014b. The new version doesn't represent pixel coordinates as integers. As a result, this case now looks something like this:
But you're also seeing the fact that the new renderering pipeline antialiases by default. You can turn that off using the GraphicsSmoothing property:
set(gcf,'GraphicsSmoothing','off')and then you get this:
Assuming this is the issue you're seeing, then you're probably better off upgrading to a newer version of MATLAB than actually fiddling your data. If you have to use a version of MATLAB with integer pixel coordinates, you could try fiddling the Renderer property on the figure and see if one of the other renderers looks better, but I think that the differences will probably be pretty small.
Or perhaps I've guessed incorrectly. If you are using R2014b or later, then I would really like to know more about what you're seeing.
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