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. -- https://mail.python.org/mailman/listinfo/python-list