sommthed roc

["David Holzgrefe" <dtholz@xxxx>]

Doses anyone know how to make a smothing roc  
(siroc)
 
whilst is easy to change the periods 
roc(close,10)
 
I what something that filters the noise out 
??
 
can the roc be used  with other indicators 
roc(stochk,20) for example ?