[R] Thank you, and your suggestion works
hhu at ufl.edu
Wed Oct 10 17:10:14 CEST 2007
What you told me works well.
I have tried using 'eval(parse(text="1:20 = x"))' as well as
'try(parse(text="1:20 = x"))' before but not using eval anfd try
functions together. I just added try function following your
suggestion, e.g. 'try(eval(parse(text="1:20 = x")))'and then it
Thank you very much for the nice and instant help.
On Wed Oct 10 10:02:39 EDT 2007, jim holtman <jholtman at gmail.com>
> You need to follow the posting guide and provide commented,
> 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) :
> \"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
>> 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
>> and provide commented, minimal, self-contained, reproducible
> -- Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
> What is the problem you are trying to solve?
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