transpose double[][] matrix with a java function?

    public static double[][] transposeMatrix(double [][] m){
        double[][] temp = new double[m[0].length][m.length];
        for (int i = 0; i < m.length; i++)
            for (int j = 0; j < m[0].length; j++)
                temp[j][i] = m[i][j];
        return temp;
    }

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