Dear all, Dear Peter,
thanks for you suggestions. Next time, I will try to set-up a proper example in order to post it and explain better my problem. You understood perfectly what was my problem. Thanks a lot, indeed it seems to work. If I can ask, due to the fact that I am new to thins kind of forum. In this moment, I have another problem related to the data I am working on. Should I write another post? Should I do something else related to this post? Thanks a lot again, you are my lifesaver On Sunday, 3 February 2019 16:56:44 UTC+1, Diego Avesani wrote: > Dear all, > > I am trying to apply a mask to my dataframe: > > mask = (df['datatime'] > start_date) & (df['datatime'] <= end_date) > df = df.loc[mask] > > > It seems to work pretty well. > > After that I crate the cumulative of its element as: > > > PP_cumPP = np.cumsum(df[PP_station]) > > > However, I am not able to compute PP_cumPP last element. Indeed, when I do > > len(PP_cumPP) > > I get > > 8783 > > and when I try to do: > > PP_cumPP[len(PP_cumPP)-1] > > I get an error. > > > What I am doing wrong? > > Thanks a lot for any kind of help > > Diedro -- https://mail.python.org/mailman/listinfo/python-list
