2021-03-17 21:32:06 +0200 received badge ● Popular Question (source) 2018-10-12 22:37:17 +0200 received badge ● Student (source) 2018-10-12 18:09:57 +0200 commented question Polynomial interpolation given a mathematic function f(x), an interval [a,b] and a natural number n Thanks you saved my life. 2018-10-12 14:39:38 +0200 asked a question Polynomial interpolation given a mathematic function f(x), an interval [a,b] and a natural number n Hi, i'm a computer science bachelor 's student and i'm having some trouble with this exercice, i'd like to get some help since it's my first course using sagemath, thanks, the exercice: Write a function that takes as input a mathematical function f, an interval [a, b] and a natural n and return the interpolative polynomial of the function in the n + 1 points resulting from dividing the interval into subinterval n of equal length. That is to say, a polynomial p (x) of degree ≤ n such p (xi) = f (xi), where xi = a + i * ((b-a)/n) for all i = 0, ... n. I'm stuck in the way of transforming a list into a matrix. This is what i've tried so far: def list1(a,b,n): r=(b-a)/n return [a+i*r for i in range(n+1)] def list2(a,b,n): r=(b-a)/n l=[] for i in range(n+1): l.append(a+i*r) return l def functionlist(f,llista): return[f(i) for i in llista] px=matrix(7, 1,list2(1, 5, 6)) show(px) py=matrix(7, 1, functionlist(sin, list1(1, 5, 6))) show(py) points= zip(px,py); points A=matrix(RDF,[[1,px[0],px[0]^2,px[0]^3],[1,px[1],px[1]^2,px[1]^3],[1,px[2],px[2]^2,px[2]^3],[1,px[3],px[3]^2,px[3]^3]]); A  And gives me this error: NotImplementedError Traceback (most recent call last) in () 19 points= zip(px,py); points 20 ---> 21 A=matrix(RDF,[[Integer(1),px[Integer(0)],px[Integer(0)]**Integer(2),px[Integer(0)]**Integer(3)],[Integer(1),px[Integer(1)],px[Integer(1)]**Integer(2),px[Integer(1)]**Integer(3)],[Integer(1),px[Integer(2)],px[Integer(2)]**Integer(2),px[Integer(2)]**Integer(3)],[Integer(1),px[Integer(3)],px[Integer(3)]**Integer(2),px[Integer(3)]**Integer(3)]]); A 22 23 /opt/sagemath-8.3/local/lib/python2.7/site-packages/sage/modules/free_module_element.pyx in sage.modules.free_module_element.FreeModuleElement.__pow__ (build/cythonized/sage/modules/free_module_element.c:15842)() 2019 NotImplementedError 2020 """ -> 2021 raise NotImplementedError 2022 2023 def _repr_(self): NotImplementedError:  Pls help, thanks.