diff --git a/arithmetic_analysis/newton_forward_interpolation.py b/arithmetic_analysis/newton_forward_interpolation.py new file mode 100644 index 000000000..09adb5113 --- /dev/null +++ b/arithmetic_analysis/newton_forward_interpolation.py @@ -0,0 +1,55 @@ +# https://www.geeksforgeeks.org/newton-forward-backward-interpolation/ + +import math + +# for calculating u value +def ucal(u, p): + """ + >>> ucal(1, 2) + 0 + >>> ucal(1.1, 2) + 0.11000000000000011 + >>> ucal(1.2, 2) + 0.23999999999999994 + """ + temp = u + for i in range(1, p): + temp = temp * (u - i) + return temp + + +def main(): + n = int(input("enter the numbers of values")) + y = [] + for i in range(n): + y.append([]) + for i in range(n): + for j in range(n): + y[i].append(j) + y[i][j] = 0 + + print("enter the values of parameters in a list") + x = list(map(int, input().split())) + + print("enter the values of corresponding parameters") + for i in range(n): + y[i][0] = float(input()) + + value = int(input("enter the value to interpolate")) + u = (value - x[0]) / (x[1] - x[0]) + + # for calculating forward difference table + + for i in range(1, n): + for j in range(n - i): + y[j][i] = y[j + 1][i - 1] - y[j][i - 1] + + summ = y[0][0] + for i in range(1, n): + summ += (ucal(u, i) * y[0][i]) / math.factorial(i) + + print("the value at {} is {}".format(value, summ)) + + +if __name__ == "__main__": + main()