R devel - Aug 2005 - Handling warning messages

Hi,

I have query regarding R & Rserve. In Rserve, there is a way to capture
Errors by RSrvException class, but is there any way to capture warning
messages?

   I have found that there is "warnings()" command in R, which lists
the
last warning message, but I am not able to get the warning message in java
program by executing the following line:

REXP rx = null;
rx = connection.eval("x<-sqrt(-9)"); // will generate warning
message
connection.eval("warnings()").asString(); // this displays null
instead of
warning message

Please reply me correct way, if any, to display warning message.

Regards,
Nikhil Shah

On Fri, 12 Aug 2005, Nikhil Shah wrote:
> I have query regarding R & Rserve. In Rserve, there is a
> way to capture Errors by RSrvException class, but is there
> any way to capture warning messages?
options(warn = 2) work for you?
> I have found that there is "warnings()" command in R, which
> lists the last warning message, but I am not able to get
> the warning message in java program by executing the
> following line:
>
> REXP rx = null;
> // will generate warning message
> rx = connection.eval("x<-sqrt(-9)");
> // this displays null instead of warning message
> connection.eval("warnings()").asString();
>
> Please reply me correct way, if any, to display warning
> message.
Probably need some mods to your Java source to handle this
but something like the following would enable you to
receive notice of errors/warnings. But it's hard to answer
this question in terms of context since I have no idea what
you're doing.

tryCatch(x<-sqrt(9),
         warning = function(w) w,
         error = function(e) e)

And Java programming questions are inappropriate for the
R-help mailing list.

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