b6196e115a16409003649c4080a59037c2b679f1,mlxtend/preprocessing/scaling.py,,standardize,#,54

Before Change

    else:
        raise AttributeError("Input array must be a pandas DataFrame or NumPy array")

    ary_newt[:, columns] = (ary_newt[:, columns] - ary_newt[:, columns].mean(axis=0)) /\
                       ary_newt[:, columns].std(axis=0, ddof=ddof)

    return ary_newt[:, columns]

After Change

                             "DataFrame or NumPy array")

    numerator = ary_newt[:, columns] - ary_newt[:, columns].mean(axis=0)
    denominator = ary_newt[:, columns].std(axis=0, ddof=ddof)
    ary_newt[:, columns] = numerator / denominator

    return ary_newt[:, columns]

Instances