Computation times

00:01.125 total execution time for 4 files from gallery/histograms:

Example	Time	Mem (MB)
Blockmean (blockm.py)	00:00.506	0.0
Scatter plot with histograms (scatter_and_histograms.py)	00:00.278	0.0
Histogram (histogram.py)	00:00.210	0.0
Rose diagram (rose.py)	00:00.131	0.0