This function takes in a data frame and calculates the cumulative P&L, daily P&L, annualized P&L, P&L volatility and dollar sharpe ratio as well as three biggest drawdowns. There are also average daily return rate and the standard deviation of daily return rates.

1 | ```
calc_pnl(x, trade.freq = 7)
``` |

`x` |
A data frame that contains data for individual commodities. |

`trade.freq` |
The trading frequency of the portfolio, numeric |

a list ith cumulative pnl, mean pnl, annualized volatility of pnl, dollar sharpe ratio and drawdown

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