Finding the row number of nth largest value

Finding the row number of the nth largest value in Pandas refers to the process of identifying the row number or index of the nth largest value in a specific column of a pandas dataframe. The row number can be useful when you want to locate or manipulate a particular row in the dataframe.

Here’s a detailed explanation of the methods mentioned to get the row number of the nth largest value in a column in Pandas:

1. Using "nlargest()" and "index()" methods:

The nlargest() method returns the n largest values from a column in descending order. We can then use the index() method to get the index labels of those values. By using [-1] to access the last label in the index, we get the row number of the nth largest value in the column.

Example:
In this example, we are getting the row number of the 3rd largest value in the 'col2' column. First, we use the `nlargest()` method to get the top n largest values in the 'col2' column. Then, we use the `index()` method to get the index labels of those values. Finally, we use [-1] to access the last label in the index, which gives us the row number of the 3rd largest value in the 'col2' column.

2. Using "sort_values()" and "iloc()" methods:

The sort_values() method sorts the dataframe by a specified column in ascending or descending order. We can then use the iloc() method to get the row number of the nth largest value in the column.

Example:
In this example, we are getting the row number of the 3rd largest value in the 'col2' column. First, we use the `sort_values()` method to sort the dataframe by the 'col2' column in descending order. Then, we use the `iloc()` method to access the row at index n-1 (since indexing starts at 0) and use the `name` attribute to get the index label of that row. Finally, we get the row number of the nth largest value in the 'col2' column.

3. Using "argsort()" and "iloc()" methods:

The `argsort()` method returns the indices that would sort an array in ascending order. We can then use the `iloc()` method to get the row number of the nth largest value in the column.

Example: