# Python | sympy.rf() method

With the help of sympy.rf() method, we can find the Rising factorial. Rising factorial is defined by –

where x can be arbitrary expression and k is an integer.

Syntax: rf(x, k)

Parameter:
x – It denotes any arbitrary expression.
k – It denotes an integer.

Returns: Returns rising factorial corresponding to the given inputs.

Example #1:

 # import sympy   from sympy import *     x = symbols('x')  k = 5 print("Value of x = {} and k = {}".format(x, k))      # Use sympy.rf() method   rf_x_k = rf(x, k)           print("Rising factorial rf(x, k) : {}".format(rf_x_k))

Output:

Value of x = x and k = 5
Rising factorial rf(x, k) : x*(x + 1)*(x + 2)*(x + 3)*(x + 4)


Example #2:

 # import sympy   from sympy import *     x = 7 k = 5 print("Value of x = {} and k = {}".format(x, k))      # Use sympy.rf() method   rf_x_k = rf(x, k)           print("Rising factorial rf(x, k) : {}".format(rf_x_k))

Output:

Value of x = 7 and k = 5
Rising factorial rf(x, k) : 55440


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