# Find the position of number that is multiple of certain number

• Last Updated : 11 Oct, 2020

In this type of question, a number is given and we have to find the position or index of all multiples of that number. For doing this question we use a function named numpy.argwhere().

Syntax:

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```numpy.argwhere(array)
```

Example 1:

Sometimes we need to find the indexes of the element that are divisible by int or float number.

## Python3

 `# Importing Pandas and Numpy libraries``import` `pandas as pd``import` `numpy as np`` ` `# Creating a Series of random numbers``n_series ``=` `pd.Series(np.random.randint(``1``, ``25``, ``15``))``print``(``"Original Series:\n"``)``print``(n_series)`` ` `# Finding the indexes of numbers divisible by 3``res_index ``=` `np.argwhere(n_series ``%` `3``=``=``0``)``print``(``"Positions of numbers that are multiples of 3:\n"``)``print``(res_index)`

Output: In the above example, we find the indexes of all numbers divisible by 3.

Example 2:

## Python3

 `# Importing Pandas and Numpy libraries``import` `pandas as pd``import` `numpy as np`` ` `# Creating a Series of random numbers``n_series ``=` `pd.Series(np.random.randint(``1``, ``20``, ``10``))``print``(``"Original Series:\n"``)``print``(n_series)`` ` `# Finding the indexes of numbers divisible by 3.5``res_index ``=` `np.argwhere(n_series ``%` `3.5``=``=``0``)``print``(``"Positions of numbers that are multiples of 3.5:\n"``)``print``(res_index)`

Output: In the above example, we find the indexes of all numbers divisible by floating-point number 3.5

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