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 […]
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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
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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
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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
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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
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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
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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
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In this tutorial, we will look at how to check if a numpy matrix (a 2d numpy array) is invertible or not with the help of some examples. When is a matrix invertible? A square matrix, for example, M is said to be invertible, if there exists a matrix N such that, MN = NM
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In this tutorial, we will look at how to check if a numpy matrix (a 2d numpy array) is a symmetric matrix or not with the help of some examples. What is a symmetric matrix? A matrix is said to be symmetric if it is equal to its transpose. That is, the matrix and its
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In this tutorial, we will look at how to check if a numpy matrix (a 2d numpy array) is a square matrix or not with the help of some examples. What is a square matrix? A matrix is said to be a square matrix if the number of rows is equal to the number of
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