On Tuesday, January 5, 2016 at 3:58:44 PM UTC-5, Joel Goldstick wrote: > On Tue, Jan 5, 2016 at 3:45 PM, Robert <rxjw...@gmail.com> wrote: > > > On Tuesday, January 5, 2016 at 3:37:53 PM UTC-5, John Gordon wrote: > > > In <e9f1d94f-4dd6-49b5-bf5c-bbcdc8d30...@googlegroups.com> Robert < > > r...@gmail.com> writes: > > > > > > > //////////// > > > > # represent the experiments > > > > head_counts = np.array([5,9,8,4,7]) > > > > > > The code doesn't define 'np', so this line should produce an error. > > > > > > The code you linked contains this import: > > > > > > import numpy as np > > > > > > However you didn't show it here, so I wonder if you posted the real code. > > > > > > > sum(expectation_A)[0] > > > > > > --------------------------------------------------------------------------- > > > > IndexError Traceback (most recent call > > last) > > > > <ipython-input-145-d6f33dff0343> in <module>() > > > > ----> 1 sum(expectation_A)[0] > > > > > > > IndexError: invalid index to scalar variable. > > > > ////////////// > > > > > > The built-in function sum() returns a single value, not a list, so this > > > is a reasonable error. > > > > > > I suspect the code actually intended to call numpy.sum(), which does > > > return a list (or something like a list). > > > > > > -- > > > John Gordon A is for Amy, who fell down the stairs > > > gor...@panix.com B is for Basil, assaulted by bears > > > -- Edward Gorey, "The Gashlycrumb Tinies" > > > > Thanks, John. When I typed my new thought, your reply came. You are right. > > The attached message missed numpy import (In my file, it had). > > > > Now, I cannot use np.sum. It has an error, see below please. How can I use > > the numpy sum()? > > > > Thanks, > > ///////// > > import numpy as np > > > > In [154]: np.sum(expectation_A)[0] > > --------------------------------------------------------------------------- > > IndexError Traceback (most recent call last) > > <ipython-input-154-1e2cbda689a3> in <module>() > > ----> 1 np.sum(expectation_A)[0] > > > > IndexError: invalid index to scalar variable. > > > > I've not used numpy, but you should print expectation_A to see what's in > it. It may be empty, causing the index. It may be that expectation_A is > an integer, not a list > > > > > -- > > https://mail.python.org/mailman/listinfo/python-list > > > > > > -- > Joel Goldstick > http://joelgoldstick.com/stats/birthdays
Thanks. It has sum method. OK now. -- https://mail.python.org/mailman/listinfo/python-list