def v_tradevolume(self, **vkwds):
'''
visualization on trade summary of the funds combination
:param vkwds: keyword argument for pyecharts Bar.add()
:returns: pyecharts.Bar()
'''
return vtradevolume(self.totcftable, **vkwds)
def v_tradevolume(self, freq="D", rendered=True):
"""
visualization on trade summary of the funds combination
:param freq: one character string, frequency label, now supporting D for date,
W for week and M for month, namely the trade volume is shown based on the time unit
:returns: ``pyecharts.Bar()``
"""
return vtradevolume(self.totcftable, freq=freq, rendered=rendered)