Ok, I figured this one out myself. The problem was due to a possible bug or lack of feature in the resample function for timeseries.
When time in a timeseries object is numeric, that is not a datestring, it seems that resample ignores the time unit information in the timeseries object and...
I have two time series objects:
FLOW, with 8382 samples
Start time 8.890500e+002 minutes
End time 5.242600e+003 minutes
PRESSURE with 16256 samples
Start time 1.674965e+000 days
End time 3.556331e+000 days
The origo of both are the same (0 minutes in the first = 0 days in the second) I...