[R] how to ignore error messages?

[Jianping Jin]

Dear group:

I wrote a code to iterate a non-linear fit with a set of data. The entire 
process didn't implemented to the end because an error message, "singular 
gradient". I knew that some sub-sets (columns) do not fit my formula well 
and may result in parameters going to infinity. It is pretty hard to remove 
those sub sets before running the code since that will take a lot of time.

I added some logic assessments prior to running nonlinear fit. It helped 
but some exceptions still existed. I am wondering if there is any way in R 
by which I can continue to run the entire code to the end by ignoring the 
error message?

Greatly appreciate your help,

Jianping

##################################
Jianping Jin Ph.D.
Bioinformatics scientist
Center for Bioinformatics
Room 3133 Bioinformatics building
CB# 7104
University of Chapel Hill
Chapel Hill, NC 27599
Phone: (919)843-6105
FAX:   (919)843-3103
E-Mail: jjin at email.unc.edu