You can change the marker to a point by setting marker='.'
, and then further reduce its size by removing the outline using linewidths=0
. Note that markeredgewidth
does not work with scatter
.
Consider this example. As you can see, the last line of points plotted ( marker='.', s=1, linewidths=0
) gives the smallest markers:
import matplotlib.pyplot as plt
import numpy as np
fig, ax = plt.subplots(1)
x = np.linspace(0, 10, 100)
ax.scatter(x, np.ones_like(x)+0, marker='o', s=1, color='k')
ax.scatter(x, np.ones_like(x)+1, marker='o', s=1, color='k', linewidths=0)
ax.scatter(x, np.ones_like(x)+2, marker='.', s=1, color='k')
ax.scatter(x, np.ones_like(x)+3, marker='.', s=1, color='k', linewidths=0)
plt.show()
In scatterplot, the points have marker which is a symbol, like circle, and this symbol has also a border. I think the border is on by default. Try to turn off the bored, like set its width to 0.
http://matplotlib.org/api/lines_api.html#matplotlib.lines.Line2D.set_markeredgewidth
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