problems when ploting indicator

I import the indicator from outside backtrader. The indicator varies between 0 and real number. I do not want to show those 0s when ploting my indicator. The following picture shows what I get. Those sudden drops are al zeros. pretty ugly.
I thought one way.bt.If(self.data.my_signal!=0, values, )
But it seems there must be a real number for the second parameter in
bt.If
Hope somebody can help me. many thanks.
Here is my full code.class LongShort(bt.Indicator): lines = ('my_signal',) plotlines = dict( my_signal=dict(_name='my_signal', color='blue', ls='', _skipnan=True), ) def __init__(self): values=btind.SMA(self.data.my_signal, period=1) self.lines.my_signal=bt.If(self.data.my_signal!=0, values,values) class MyStrategy(bt.Strategy): def __init__(self): LongShort(self.data,subplot=0) cerebro = bt.Cerebro(stdstats=False) cerebro.addstrategy(MyStrategy) data =CustomDataLoader(dataname=df_gold) cerebro.adddata(data) cerebro.run() # Plot the result cerebro.plot(style='candle',iplot=0,volume=False)

You could consider importing two indicators. One with the zeros you use for calculations. The other you remove the zeros and foward fill to that you will have a smooth line. You could use the second for plotting?

@dazhang said in problems when ploting indicator:
Try
None
:bt.If(self.data.my_signal!=0, values, None)

@ab_trader said in problems when ploting indicator:
None
It cannot work. Can you find other ways?
File "C:\ProgramData\Anaconda3\lib\sitepackages\backtrader\functions.py", line 190, in once dst[i] = srca[i] if cond[i] else srcb[i] TypeError: must be real number, not NoneType

@runout
How to remove the zeros in the init part? 
The problem here is the definition:
@dazhang said in problems when ploting indicator:
The indicator varies between 0 and real number
This would seem to indicate that the indicator travels (like a stochastic, for example), between
0.0
and a given (may be open) upper limit. But IT IS NOT so. The real definition is: It is a binary indicator with either
0.0
or a value which is not related in any way to a possible previous0.0
, but actually to the previous nonzero values.
That indicator needs rework to either remove the zeros or use them in a proper way.
 It is a binary indicator with either