guRus

Is there a way by which I can search for a particular function or a
particular line of code within the maze of all the R codes that are
interlinked? Say for instance I am running a code using quantstrat package
and on a particular line I get the error saying x is missing in is.array(x).
I want to figure out where is.array is in all the codes that my code refers
to? How do I do this? Is there like a grep or search function that can say
tell me that 'here is the function inside which is.array(X) is being called'
etc?

out<-try(applyStrategy(strategy=stratSMA5D , portfolios=portfolio.st))
Error in is.array(x) : 'x' is missing

Thx
-- 
'Raghu'

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