index out of bounds in correlation plot

[sdvillal]

We get an index-out-of-bounds with this (and others) Etienne experiments

./translation-analysis.py --uuid f8fd79b0548111e4b9debcee7bdac37c --zfilt trim --zfilt-max 0.365 --zfilt-min 0.05 --rfilt trim --reindex --arena flycube --lenfilt 1 --cached --out /tmp

Traceback (most recent call last):
  File "./translation-analysis.py", line 95, in <module>
    curve.plot_correlation_analysis(args, combine, correlations, correlation_options)
  File "/home/santi/Proyectos/imp/software/strawlab_freeflight_experiments/src/analysislib/curvature.py", line 369, in plot_correlation_analysis
    max_latencies_shift[_current_condition] = (latencies[ccef_m.argmax()], ccef_m.max())
IndexError: list index out of range

This seems related but different to #4

[sdvillal]

This and #4 are both related to the change of argmax semantics between pandas 0.12 and 0.13. Important to point out the new semantics of argmax in pandas:

• It is a synonym of idxmax and therefore returns a value from the index, instead of a location
  • We can get the location using either s.index.get_loc(s.idxmax()) or np.argmax(s)
• It returns nan if the max does not exist (= we have a series with all missing values or values that do not have a partial order).