On Mon, 4 Jan 2016 11:28 am, Robert wrote: > Hi, > > I find below code snippet on line: > > > ////////// > m = 10 > theta_A = 0.8 > theta_B = 0.3 > theta_0 = [theta_A, theta_B] > > coin_A = bernoulli(theta_A) > coin_B = bernoulli(theta_B) > > xs = map(sum, [coin_A.rvs(m), coin_A.rvs(m), coin_B.rvs(m), coin_A.rvs(m), > coin_B.rvs(m)]) ///////// > > I see > [coin_A.rvs(m), coin_A.rvs(m), coin_B.rvs(m), coin_A.rvs(m), > [coin_B.rvs(m)] > > is simply a list,
A list of what? Without knowing what coin_A.rvs(m) returns, it is impossible to know what sum will do. > but I don't know what use of 'sum' in this line. > I replace the random number with a simple list: > /////// > yy=map(sum, [13, 22, 33, 41]) > In [24]: yy > Out[24]: [13, 22, 33, 41] I do not get that result. I get an error: py> yy = map(sum, [13, 22, 33, 41]) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'int' object is not iterable Try replacing the list-of-mystery-things with a list of lists: map(sum, [[1, 2, 3], [4, 5, 6], [7, 8, 9]]) and see what you get. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
