Python | sympy.rewrite() method (original) (raw)

Last Updated : 7 Jul, 2019

With the help of sympy.rewrite() method, we can represent any mathematical function in terms of another function.

Syntax: expression.rewrite(function) Parameters: expression - It is mathematical expression which is to be represented by another function.function - It is the mathematical function used to rewrite the given expression.Returns: Returns a mathematical expression corresponding to the input in terms of specified function.

Example #1:

Python3 1== `

import sympy

from sympy import *

x = symbols('x') expr = tan(x) print("Expression = {}".format(expr))

Use sympy.rewrite() method

expr_in_terms_of_sin = expr.rewrite(sin)

print("Expression in terms of sin() : {}".format(expr_in_terms_of_sin))

`

Output:

Expression = tan(x) Expression in terms of sin() : 2*sin(x)*2/sin(2x)

Example #2:

Python3 1== `

import sympy

from sympy import *

x = symbols('x') expr = factorial(x) print("Expression = {}".format(expr))

Use sympy.rewrite() method

expr_in_terms_of_gamma = expr.rewrite(gamma)

print("Expression in terms of gamma() : {}".format(expr_in_terms_of_gamma))

`

Output:

Expression = factorial(x) Expression in terms of gamma() : gamma(x + 1)