[R] How to catch a R error in R code
jholtman at gmail.com
Wed Oct 10 16:02:39 CEST 2007
You need to follow the posting guide and provide commented, minimal,
self-contained, reproducible code.
I can only guess at what your code looks like, but the following
catches the error:
> z <- try(eval(parse(text="1:20 <- x")))
Error in eval(expr, envir, enclos) : object "x" not found
Class 'try-error' chr "Error in eval(expr, envir, enclos) : object
\"x\" not found\n"
> z <- try(eval(parse(text="x <- 1:20")))
int [1:20] 1 2 3 4 5 6 7 8 9 10 ...
On 10/10/07, HU,ZHENGJUN <hhu at ufl.edu> wrote:
> Hi All,
> I entered a R statement, e.g. 1:20 = x or log("a") on an HTML
> form and passed it to a R-CGI script. Obviously, neither of both
> is a correct R statement or expression. However, my R-CGI script
> could not return and report the error message to the Web site even
> though it received the statement. I tried to use some R built-in
> functions of try, tryCatch, eval, expression, as.expression,
> parse, deparse, etc. None of them worked.
> Note: when a statement is correct, i.e. x = 1:20 or log(2), the
> same script returned and reported the R output to the Web site.
> If any of you has the experience about the matter or topic,
> could you please tell me how to catch a R error in this case?
> Thank you very much for the help in advance.
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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What is the problem you are trying to solve?
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