def METHOD_NAME(jn_matrix, m_matrix):
    """transforms PCA vectors so that signs are correct"""
    m_matrix_trans = m_matrix.transpose()
    jn_matrix_trans = jn_matrix.transpose()
    new_matrix= zeros(jn_matrix_trans.shape, float)
    for i, m_vector in enumerate(m_matrix_trans):
        jn_vector = jn_matrix_trans[i]
        disT = list(m_vector - jn_vector)
        disT = sum(map(abs, disT))
        jn_flip = jn_vector*[-1]
        disF = list(m_vector - jn_flip)
        disF = sum(map(abs, disF))
        if disT > disF:
            new_matrix[i] = jn_flip
        else:
            new_matrix[i] = jn_vector
    return new_matrix.transpose()