Modern R Programming Cookbook

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An output data type could be one of the many available data types in R, and you could organize the output into a different data structure. For example, the output of this function can be returned as a list of two named elements by creating the function as follows:

    meanSe <- function(numVec){      if(is.numeric(numVec) & is.vector(numVec)){        avg <- mean(numVec)        std <- sd(numVec)        se <- std/sqrt(length(numVec))        out <- list(mean = avg, standardError = se)        return(out)     }    }