search for: elstims

...I have not found the key to generating the logical AND equivalent of the "|" OR infix operator, a proxy for the simpleton's dream: my.list.files(pattern="*Elstim" & "*post") Thanks - Derek P.S., Of course I could always do this in stages: > elstims <- list.files(pattern = "Elstim") # all the files with "Elstim" > ElPostinos <- grep("post",elstims) # all the elstim files with "post" > my.file.list <- elstims[ElPostinos] # result: list of filenames But my conscience would bother me f...