Returns a DataFrame with the required format for 
	a candlestick or ohlc plot
	df[['open','high','low','close']]

	Parameters:
	-----------
		n : int
			Number of ohlc points

def ohlc(n=100):
	"""
	Returns a DataFrame with the required format for 
	a candlestick or ohlc plot
	df[['open','high','low','close']]

	Parameters:
	-----------
		n : int
			Number of ohlc points
		
	"""	
	index=pd.date_range('1/1/15',periods=n*288,freq='5min',tz='utc')
	data=np.random.randn(n*288)
	data[0]=np.array([100])
	df=pd.DataFrame(data,index=index,
		columns=['a'])
	df=df.cumsum()  
	df=df.resample('1d').ohlc()
	df.index=df.index.date
	df.index=pd.to_datetime(df.index)
	return df['a']