How do you do lcm in math in python?

The math module in Python contains a number of mathematical operations. Amongst some of the most important functions in this module is the lcm() function which returns the least common multiple of the specified integer arguments.

The lcm function was newly introduced in the Python version 3.9.0.

Solution approach

The Least Common Multiple (LCM) of a group of numbers is the least possible number that is divisible by all the numbers in the group.

For example, the LCM of 2, 3, and 4 is 12, because 12 is the least number which is divisible by all three numbers.

Syntax

The syntax of the math.lcm() function is shown below.

math.lcm(x1, x2, x3,... xn)

Note: The math.lcm() function is available in Python 3.9.0 and higher.

Parameters

The math.lcm() function accepts n integers, where n = any real number.

Return value

The math.lcm() function returns the least common multiple of the specified numbers.

  • If all the provided numbers are 00 , it returns 00.
  • If no arguments are provided, it returns 11.
  • If a float or string parameter is provided, the math.lcm() method returns a TypeError.

Code

The code snippet below shows how the math.lcm() works in Python.

import math
print(math.lcm(2,3,4))

Use math.lcm() function in C++

Explanation

  • Line 1 imports the math module.

  • In line 2, the math.lcm() method computes the LCM of 2, 3, and 4, which are printed accordingly.

I am currently using a function that accepts two numbers and uses a loop to find the least common multiple of those numbers,

def lcm(x, y):
   """This function takes two
   integers and returns the L.C.M."""

   # Choose the greater number
   if x > y:
       greater = x
   else:
       greater = y

   while(True):
       if((greater % x == 0) and (greater % y == 0)):
           lcm = greater
           break
       greater += 1

   return lcm

Is there a built-in module in Python that does it instead of writing a custom function?

How do you do lcm in math in python?

asked Aug 6, 2018 at 23:33

0

In Python 3.8 and earlier

There is no such thing built into the stdlib.

However, there is a Greatest Common Divisor function in the math library. (For Python 3.4 or 2.7, it's buried in fractions instead.) And writing an LCM on top of a GCD is pretty trivial:

def lcm(a, b):
    return abs(a*b) // math.gcd(a, b)

Or, if you're using NumPy, it's come with an lcm function for quite some time now.

How do you do lcm in math in python?

Mark Amery

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answered Aug 6, 2018 at 23:39

abarnertabarnert

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2

In Python 3.9+

This is available as math.lcm(). It also takes any number of arguments, allowing you to find the lowest common multiple of more than 2 integers.

For example:

>>> from math import lcm
>>> lcm(2, 5, 7)
70

answered Mar 23, 2020 at 22:26

How do you do lcm in math in python?

OrangutanOrangutan

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Try this instead:

def lcm(x, y):
    from fractions import gcd # or can import gcd from `math` in Python 3
    return x * y // gcd(x, y)

answered Aug 6, 2018 at 23:37

Tim PetersTim Peters

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5

To simplify your code a little:

def lcm(x, y):
    for currentPossibleLCM in range(max(x,y), (x*y)+1)
         if((currentPossibleLCM % x == 0) and (currentPossibleLCM % y == 0)):
              return currentPossibleLCM

Runtime: O(x*y)

answered Mar 9, 2020 at 22:22

How do you do lcm in math in python?

Satbir KiraSatbir Kira

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This is not only for two numbers specifically but for finding LCM of an array of integers. (without using math.lcm())

import math
from functools import reduce

def lcm(arr):

    l=reduce(lambda x,y:(x*y)//math.gcd(x,y),arr)
    return l

answered Dec 26, 2021 at 19:30

How do you do lcm in math in python?

How do you use LCM in Python?

The math. lcm() function returns the least common multiple of the specified numbers..
If all the provided numbers are 0, it returns 0..
If no arguments are provided, it returns 1..
If a float or string parameter is provided, the math. lcm() method returns a TypeError ..

What does LCM mean in Python?

The Least Common Multiple (LCM) is also referred to as the Lowest Common Multiple (LCM) and Least Common Divisor (LCD). For two integers a and b, denoted LCM(a,b), the LCM is the smallest positive integer that is evenly divisible by both a and b.

How do you find HCF and LCM in Python?

Algorithm.
Initialize HCF = 1..
Run a loop in the iteration of (i) between [1, min(num1, num2)].
Note down the highest number that divides both num1 & num2..
If i satisfies (num1 % i == 0 && num2 % i == 0) then new value of HCF is i..
Use lcm formula :- (num1*num2) / hcf..
Print the output..

How do I calculate LCM?

How to Find LCM using Prime Factorization?.
Step 1: Find the prime factors of the given numbers by repeated division method. Here, it will be 6 = 2 × 3, and 8 = 2 × 2 × 2..
Step 2: Write the numbers in their exponent form. ... .
Step 3: The product of these factors with the highest powers will be the LCM of the given numbers..