how to make hollow square marks with matplotlib in python

27
votes

Black line in the following graph is plotting using the below command for matplotlib python

pylab.semilogy(xaxis, pq_averages, 'ks-',color='black', label='DCTCP-PQ47.5')

So 'ks-' part indicates solid line with square black marks. So it had solid squares for the plotted points. Can these squares be made hollow instead?

enter image description here

2
pythonmatplotlib
microseconds is typically one word :-) - jedwards

2 Answers

41
votes

Try adding markerfacecolor like so:

pylab.semilogy(xaxis, pq_averages, 'ks-', markerfacecolor='none', label='DCTCP-PQ47.5')
11
votes

Setting markerfacecolor='white' does not actually make them hollow, it makes them white. In order to make them hollow, you need to set markerfacecolor='none'. Additionally, you need to set markeredgecolor to the color you want. So:

pylab.semilogy(xaxis, pq_averages, 'ks-',color='black',
       label='DCTCP-PQ47.5', markerfacecolor='none', markeredgecolor='black')

Will do the job for you.