Computation times

00:01.225 total execution time for 4 files from gallery/histograms:

Example	Time	Mem (MB)
Blockmean (blockm.py)	00:00.618	0.0
Scatter plot with histograms (scatter_and_histograms.py)	00:00.266	0.0
Histogram (histogram.py)	00:00.212	0.0
Rose diagram (rose.py)	00:00.129	0.0