> - To execute R code contained in a string and return the result of this
> evaluation in a string (including presentation of error messages and
> warnings) exactly as if this was entered at the prompt. Duncan Murdoch
> is against such a kind of function (he says a GUI should not substitute
> to the R interpreter, and it should manage and present errors or
> warnings in a better way than the teletype approach of the command
This is useful for useful for things like Sweave. I have a modified
version of capture.output that captures everything:
capture.all <- function(code, envir = globalenv()) {
printErrors <- function(code) {
tryCatch(
eval(parse(text=code), envir = envir),
error = function(e) o(e)
)
}
paste(capture.output(
withCallingHandlers(printErrors(code), warning = function(x) {
cat("Warning: ", x$message, "\n")
invokeRestart("muffleWarning")
})), collapse="\n", sep="")
}
for my (unreleased) sweave-like package. It's not perfect, but it has
served my needs.
Hadley
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