backticks
Robin Hankin wrote:
I noticed just now that package.skeleton() produces R files in which the function names are escaped with backticks. ?Quotes says that "The preferred quote is the backtick (`)", but I don't understand _why_ this is preferred. ?formula gives some clues but points out that there are no guarantees that formulae using non-syntactic names such as `like this` will be accepted. What exactly do backticks do that single or double quotes don't?
I don't know whether we really want to be that dogmatic about it, but in
a nutshell
`like this` <- 2
"like that" <- 3
print(`like this`)
print("like that")
I.e. backtick'ed names work whereever ordinary names do, but quoted
names work only on the LHS of assignments.
The note in ?formula should probably be understood defensively: We
intend backtick'ed names to work in all contexts, but there may be
programming practices where the backticks are not preserved (notably if
there is a deparse-reparse step involved).
Where do I look for documentation on this? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743
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