#def np: read_csv -> vs open?
#def copy() -> np: create deep copy
#def view() -> np: creates a view?! wiht the same data..
#def info()
#def size()
#def astype(typestring/object, numpy/pandas?)
# comparisons: ==, <
# comparison: np: array_equal (array_wise comparison)
#add
#multiply
#exp
#sum (np: array wise)
#cumsum (np: all elems)
#min
#max
#median
#mean
#std
#corrcoef ?? interpretation? seems to make more sense for two different reports? that can work i think
# special treatmet dxt? -> corr over time?