Question: Write a function scale _ row that takes a matrix ( NumPy array ) , an integer i and an integer scalar as input. The

Write a function scale_row that takes a matrix (NumPy array), an integer i and an integer scalar as input.
The function should check if the specified row index (i) is within the valid range
If i is valid, the function should scale the i-th row of the matrix by a given scalar value and return the modified matrix.
If the row i is not valid, print "Row not valid."

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