catch error/warning message in a loop

cat can only catch the error message promptly, but
seems not able to catch the warning message promptly.
Can anyone point out how i can catch the warning
message in a loop?


--- Spencer Graves <spencer.graves at PDF.COM> wrote:

  With situations like this, I often include
something like "cat(i, 
'')" in the loop (where "i" is the index of the
loop).

  If I'm writing a function to be used by others, I
might use "try", as 
described, e.g. in Venables and Ripley (2000) S
Programming (p. 48).

hth.  spencer graves

array chip wrote:

Hi, I am running cox regreesion (coxph) on a large
number of independent variables, one variable at a
time, using loop. At some point of the loop, the

cox

regression stopped due to some errors. How can I

know

at which variable the cox regression stopped so

that I

can pinpoint the variable that causes the problem?

I

guess this is not unique to cox regression, it is

the

problem of catching the error/warning message

promptly

in a loop.

tahnks

to Outlook(TM).

https://www.stat.math.ethz.ch/mailman/listinfo/r-help

http://calendar.yahoo.com

cat can only catch the error message promptly, but
seems not able to catch the warning message promptly.
Can anyone point out how i can catch the warning
message in a loop?