In this tutorial, we will look at how to fix the ParseError: year 0 is out of range 0000-00-00 error when using the pandas.to_datetime() function with the help of an example. Why does this occur when using pandas.to_datetime()? We use the pandas.to_datetime() function to convert a value or column to datetime type. The “pandas ParserError: …

In this tutorial, we will look at how to fix the OutOfBoundsDatetime: Out of bounds nanosecond timestamp error when using the pandas.to_datetime() function with the help of an example. Why does the OutOfBoundsDatetime error occur when using pandas.to_datetime()? We use the pandas.to_datetime() function to convert a value or column to the pandas datetime type. The …

In this tutorial, we will look at how to rename the column resulting from the reset_index() function in pandas with the help of some examples. The pandas dataframe reset_index() function is used to reset the index of a dataframe and by default, it adds the previous index as a separate column in the dataframe (pass …

In this tutorial, we will look at how to rename the columns of a dataframe resulting from the merge of two dataframes. When you’re merging two dataframes that have columns with the same names, pandas gives them default suffixes like _x, or _y to keep the names of the columns different in the resulting dataframe …

You can use the following steps to rename columns after the groupby operation on a pandas dataframe. Note that if you try to change the name of the grouping column (“col1”), you’ll get an error. This is because the resulting dataframe after groupby doesn’t have the grouping column (“col1”), its unique values are used as …

In this tutorial, we will look at how to sort a numpy array by a column with the help of some examples. To sort a numpy array by a given column, use the following steps – The following is the syntax – The above code sorts the array by the values in the column with …

In this tutorial, we will look at how to count unique values in a Numpy array with the help of some examples. There’s no direct function (like the Pandas nunique() function for a pandas series) to get the count of unique values in a Numpy array. You can, however, use the numpy.unique() function to get …

In this tutorial, we will look at how to check if a matrix is an identity matrix in Numpy with the help of some examples. What is an identity matrix? An identity matrix is a square matrix with all diagonal elements as 1 and all non-diagonal elements as zero. The following image shows some identity …

In this tutorial, we will look at how to check if two matrices (2d numpy arrays) are equal or not with the help of some examples. How to check if two matrices are equal in numpy? There are multiple ways using which you can assess whether two numpy arrays (including 2d arrays which we generally …

In this tutorial, we will look at how to check if a numpy matrix (a 2d numpy array) is orthogonal or not with the help of some examples. When is a matrix orthogonal? A real square matrix, for example, M is said to be orthogonal, if the dot product of the matrix with its transpose …