class_docstr: A :class:`pyalgotrade.stratanalyzer.StrategyAnalyzer` that records the profit/loss
  and returns of every completed trade.
  
  .. note::
      This analyzer operates on individual completed trades.
      For example, lets say you start with a $1000 cash, and then you buy 1 share of XYZ
      for $10 and later sell it for $20:
  
          * The trade's profit was $10.
          * The trade's return is 100%, even though your whole portfolio went from $1000 to $1020, a 2% return.
docstr: Returns a numpy.array with the negative returns for each trade.
docstr_tok: ["Returns","a","numpy.array","with","the","negative","returns","for","each","trade","."]
code: def getNegativeReturns(self):
      """Returns a numpy.array with the negative returns for each trade."""
      return np.asarray(self.__negativeReturns)
  
imports: from pyalgotrade import stratanalyzer
  from pyalgotrade import broker
  from pyalgotrade.stratanalyzer import returns
  import numpy
label_desc: Use image node_id 15 for calling the Trades obj's underlying member method code with example usage: obj.getNegativeReturns() and returns: np