On Tue, Dec 26, 2017 at 1:48 AM, Nico Vogeli <nicco.9...@gmail.com> wrote: > Am Montag, 25. Dezember 2017 14:51:21 UTC+1 schrieb Chris Angelico: >> On Tue, Dec 26, 2017 at 12:36 AM, Nico Vogeli <nicco.9...@gmail.com> wrote: >> > Hi everybody. First ad foremost, happy Christmas! >> >> Same to you! >> >> > I want to let the use input a function (like x**2) and parse it after that >> > through code (for my numeric class) >> > >> > def newton(x0, s, s2, tol, n = 20000): >> > ''' >> > Näherung zur lösung einer Gleichung mit dem Newton-Verfahren >> > x0 = Startwert >> > f = zu lösende Funktion >> > fx = Ableitung der Funktion >> > >> > ''' >> > def f(a): >> > y = s >> > return y >> > >> > def fx(a): >> > y = s2 >> > return y >> >> >> > newton(2, 3*x**2, 6*x, 0.1, 2) >> > >> > I notice that the x is not converted to an integer, because of the x = >> > symplos('x') >> > But I don't know how I could possibli change the code to work... >> >> The easiest way is to pass a *function* to newton(). It'd look like this: >> >> def newton(x0, f, fx, tol, n=20000): >> ... as before, but without the nested functions >> >> newton(2, lambda x: 3*x**2, lambda x: 6*x, 0.1, 2) >> >> At least, I think that's how you're doing things. Inside the nested >> functions, you use 'a', but outside, you use 'x'. Are those >> representing the same concept? If so, the lambda functions given here >> will have the same effect. >> >> Hope that helps! >> >> ChrisA > > Hi Chris > > Thanks very much for your quick response! > I was in a bit of a rush, so I confused the variables (don't worry, I just > messed arround to try different things, the original code was al tidy with > the variable). > > I tried your input, but now I get another error: > > > File "C:/Users/Nicco ZHAW/Desktop/Test GUI/Test Projekt.py", line 42, in > newton > b = x - f(x)/fx(x) > > TypeError: unsupported operand type(s) for /: 'function' and 'function' > > This did not occure befor I tried to implement the user input..
Did you remove the nested functions? The lambda functions completely replace your "def f(a)" and "def fx(a)" functions. ChrisA -- https://mail.python.org/mailman/listinfo/python-list