What is the lambdify function in Sympy

This recipe explains what is the lambdify function in Sympy

Recipe Objective - What is the lambdify function in Sympy?

The Lambdify function translates SymPy expressions into Python functions. If an expression is evaluated over a wide range of values, the evalf() function is not efficient. lambdify acts like a lambda function but converts SymPy names to the specified numeric library, usually NumPy. Lambdify, by default, is implemented in the standard math library.

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Example:

# Example 1

# Importing libraries
from sympy import lambdify
from sympy.abc import p,q

# Defining some expression
expression = (p**2)+(q**3)

# Creating function by applying lambdify
lambda_function = lambdify([p,q], expression)

# Calling function
lambda_function(4,2)

Output - 
24

# Example 2

# Importing libraries
from sympy import lambdify, tan
from sympy.abc import p,q

# Defining some expression
expression = tan(p)

# Creating function by applying lambdify
lambda_function = lambdify(p, expression)

# Calling function
lambda_function(30)

Output - 
-6.405331196646276

In this way, we can use the lambdify function in sympy.

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