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how to read matrix in.
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Here is a Python code to read matrix in Python

import numpy as np

def read_matrix(filename, delimiter=','):
        """
        Reads a matrix from a file.

        Parameters
        ----------
        filename : str
            Name of the file.
        delimiter : str, optional
            Delimiter used to separate the values. The default is ','.

        Returns
        -------
        matrix : numpy.ndarray
            The matrix.
        """
        matrix = np.genfromtxt(filename, delimiter=delimiter)
        return matrix

# Enter the filename
filename = "test.txt"

# Calling the function
matrix = read_matrix(filename)

# Printing the result
print(matrix)

#Example Output
# nan

#Remember to inspect code for bugs.