#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?