Hello readers! Welcome to another tutorial on NumPy Mathematical Functions. In this tutorial, we will be studying the NumPy lcm function in detail with examples.

You must have calculated the **lcm(least common multiple)** of two numbers in the Mathematics class. It was fun calculating it 🙂

Now, let us see how can we calculate the lcm using Python Programming Language. Let’s get started.

## What is NumPy lcm?

NumPy lcm is one of the mathematical functions of the NumPy Library that calculates the lcm of two input numbers. Here, the input numbers must be **positive**.

Let us look at the syntax of the function.

## Syntax of NumPy lcm

```
numpy.lcm(x1 , x2)
```

Here, x1 and x2 can be **single numbers** as well as a **NumPy array of Numbers**.

**Note:** The numbers **x1** and **x2** cannot be floating point digits.

## Working with NumPy lcm

Let’s write some code to work on the numpy.lcm() method and see how to use it.

### NumPy lcm with Single Number

```
import numpy as np
print("The lcm of 3 and 15 is:",np.lcm(3 , 15))
print("The lcm of 12 and 44 is:",np.lcm(12 , 44))
print("The lcm of 3 and 9 is:",np.lcm(3 , 9))
print("The lcm of 120 and 200 is:",np.lcm(120,200))
```

### Output

```
The lcm of 3 and 15 is: 15
The lcm of 12 and 44 is: 132
The lcm of 3 and 9 is: 9
The lcm of 120 and 200 is: 600
```

The outputs are pretty obvious. Now, let’s see how can we calculate the lcm of two NumPy arrays.

### NumPy lcm with NumPy Array

```
import numpy as np
a = np.array((12,44,78,144,10000))
b = np.array((24,54,18,120,100))
print("Input Arrays:\n",a,"\n",b)
print("The lcm values:\n",np.lcm(a , b))
```

### Output

```
Input Arrays:
[ 12 44 78 144 10000]
[ 24 54 18 120 100]
The lcm values:
[ 24 1188 234 720 10000]
```

picks one element from each of the two NumPy arrays and calculates their lcm.**numpy.lcm()**

That was all about the NumPy lcm function, this function is easy to understand and simple to use. Stay tuned for more such articles.