Where to load packages when sourcing an R script -


i have 2 r scripts. scriptb called in scripta via source("scriptb.r")

both scripta , scriptb load same library(x) x knitr or stringr or few other packages

however, because scriptb calls library(x) example, seems scripta forced unload library(x) , load scriptb library(x). leads following error:

error in unloadnamespace(package) :    namespace 'x' imported 'y' cannot unloaded error in library(x) : package 'x' version n.nn cannot unloaded

i don't call unloadnamespace in source script i'm not sure why happening? how can prevent unload. should use require() in scripta can fail gracefully?

so questions are:

  1. is sourcing r script best way include objects r script or there friendlier way

  2. how avoid script trying unload package x?

ok sorted it. problem think was using old versions of stringr in scripta or b updated package , runs fine. suppose r unloads same library if there versioning difference , prefers library called last. that's explanation.

i remain little confused didn't specify version of library when loading , though rstudio keeps 1 version of package.


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