Thanks for the alternative links, I'll use gmane.org as an access point next time.
> > Don't paraphrase. Just copy/paste it into your email message. And I'm > > assuming you know to run things from the terminal window, and not from > > IDLE or something else that messes up the error messages. Your comment > > about 'orange' doesn't sound promising. > > > > As Ian pointed out, you have no return value in this function. You > > calculate something called 'rtn', but never use it. The last line > > accomplishes nothing, since rtn is neither assigned nor returned, nor > > passed nor... You probably wanted: > > > > return rtn > Does something like def phi_m(x, m): rtn = [] for n2 in range(0, len(x) * m - 2): n = n2 / m r = n2 - n * m rtn.append(m * x[n] + r * (x[n + 1] - x[n])) print ('n2 =', n2, ': n =', n, ' r =' , r, ' rtn =', rtn) return rtn look right? It doesn't seem to have any errors. However, I do receive the following error when trying to implement an x after having defined phi: >>> x = [0, 1, 1, 2, 3] >>> phi_m(x, 2) Traceback (most recent call last): File "<pyshell#6>", line 1, in <module> phi_m(x, 2) File "<pyshell#2>", line 6, in phi_m rtn.append(m * x[n] + r * (x[n + 1] - x[n])) TypeError: list indices must be integers, not float -- http://mail.python.org/mailman/listinfo/python-list