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[This question has been resolved in the chat room, by Spacedman , but I'm posting it for others' benefit in the future.] I have a function, myFunc , which creates localFunc inside of it. (NB: this is not in a package, but in the global environment.) I'd like to know where localFunc exists in the search path, as I'd like to analyze it via mvbutils::foodweb . Here is an example: myFunc <- function(){ require(data.table) require(mvbutils) localFunc <- function(x){ return(as.data.table(x)) } vecPrune <- c("localFunc",ls("package:data.table")) ix <- match("data.table",search()) tmpWeb <- foodweb(where = c(1,ix), prune = vecPrune, plotting = FALSE) return(tmpWeb) } However, a call to myFunc() does not seem to indicate that localFunc calls data.table() . This is incorrect - what gives? (NB: The where argument specifies the search path.) Update 1: As Tommy and Spacedman point out, the trick is to specify environment() . The call to foodweb() refers to where = c(1, ix) . The index 1 is a mistake. That arose from thinking that .GlobalEnv , which is often (always?) the first item in the search() vector, is the right place to search. That is erroneous. Instead, one should refer to environment() , and the correct call is below. (NB: ix specifies the location of data.table() in the search() output.) tmpWeb <- foodweb(where = c(environment(),ix), prune = vecPrune, plotting = FALSE) This appears in the answer to this question

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