On Thursday, July 18, 2013 10:48:23 PM UTC-4, Fábio Santos wrote: > On 19 Jul 2013 03:24, "CTSB01" <scott.m...@gmail.com> wrote: > > > > > > 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 > > When you think about it, it makes sense. If you have a list, say, > > [2, 5, 1] > > You can say, I want the first item (0) or the third item(2) but never, the > one-and-a-halfeth (0.5) item. Python only accepts integer values when > accessing list items. > > To access list items, convert your index into an integer value.
Thanks Fabio. Is there a statement that lets me specify that I only need it to take the integer values? -- http://mail.python.org/mailman/listinfo/python-list