Fix ordering of data points

bin/plot_measurements.py

 #!/usr/bin/env python
 
+import itertools
 import pandas
 import matplotlib
 import sys
@@ -21,8 +22,10 @@ timeframe = timeframe[timeframe.what == what]
 fig, ax1 = plt.subplots()
 
 ax2 = ax1.twinx()
-ax1.plot(flopframe['degree'], flopframe['GFlops'], "b-", flopframe['degree'], flopframe['GFlops'], "bo")
-ax2.plot(timeframe['degree'], timeframe['DOFs'], "r-", timeframe['degree'], timeframe['DOFs'], "ro")
+x, y = list(itertools.izip(*sorted(itertools.izip(flopframe['degree'], flopframe['GFlops']))))
+ax1.plot(x, y, "b-", x, y, "bo")
+x, y = list(itertools.izip(*sorted(itertools.izip(timeframe['degree'], timeframe['DOFs']))))
+ax2.plot(x, y, "r-", x, y, "ro")
 
 ax1.set_xlabel("Polynomial degree")
 ax1.set_ylabel("GFlops /s", color="b")