how to set the indicator data point value as nan

[cicidad]

I want set the data point per 10 days, and connect the points, need set other data point value as NAN, hot to set it

class DummyInd(bt.Indicator):
   lines = ('dummyline',)
   plotinfo = dict(subplot=False,_skipnan=False)
   params = (('value', 0),('period', 1),)
   count =0
   def __init__(self):
           self.lines.dummyline = numpy.nan #error here, do not know how to set.
   def next(self):
       DummyInd.count +=1
       if DummyInd.count % 10==0:
           self.lines.dummyline[0] = self.data.close[0]

[cicidad]

how to initial a line object as NaN, only set some points had value

[cicidad]

I use this code implement it.

self.lines.dummyline[0] = max(float('NaN'), float('NaN'))

thanks.