cal_yield: calculate the yield
In cloud-brain/backtest: back test for stock acount

calculate the yield from net value

1	cal_yield(x, first = 0)

`x`	vector of net value
`fisrt,`	the first day yield

1 2	data(m_index_acount) cal_yield(m_index_acount$acount)

cloud-brain/backtest documentation built on Feb. 6, 2020, 11:17 p.m.

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