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plot makes strip pattern #16815

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Auto-Ken opened this issue Mar 18, 2020 · 2 comments
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plot makes strip pattern #16815

Auto-Ken opened this issue Mar 18, 2020 · 2 comments
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@Auto-Ken
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Plot function in matplotlib 3.1.3 generate following strips.

ones = np.ones((200,100))
cumsum = np.cumsum(ones, axis=1)
plt.plot(cumsum, linestyle='', marker='o', markersize=0.6, color="k");

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@timhoffm
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plot() aligns markers to pixel positions for faster and more clear rendering. Therefore markers may be shifted by fractions of a pixel. If the marker distance is not a multiple of the pixel size, you'll get these artifacts.

Duplicate of #13046 and #7233.

@timhoffm
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timhoffm commented Mar 18, 2020 •
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A possible workaround is to use scatter() with an array of sizes (with a scalar size and color scatter() would use the same code path as plot()). This comes at the cost of inhomogeneously shaped markers and slower rendering performance.

X, Y = np.meshgrid(np.linspace(0, 1, 200), np.linspace(0, 1, 100))
plt.scatter(X, Y, s=np.full_like(X, 0.6), marker='o',  color="k");

grafik

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@timhoffm @Auto-Ken