R: how to clear all warnings

问题

I would like to clear the warnings() list using a command line.

I have tried with no success

> rm(last.warning, envir = baseenv())  
Error in rm(last.warning, envir = baseenv()) :   
cannot remove variables from the base environment

any idea?

回答1:

Try assign("last.warning", NULL, envir = baseenv())

回答2:

Take a look at suppressWarnings() to stop the warnings from showing up.

Notice in the help page for warnings that it says:

"....It is undocumented where last.warning is stored nor that it is visible, and this is subject to change. Prior to R 2.4.0 it was stored in the workspace, but no longer...."

回答3:

I agree, I want to use a try() and gather up just the warnings generated by that try().

My solution for now is

assign("last.warning", NULL, envir = baseenv())
    myFit  <- try(...)
    warned <- warnings()
assign("last.warning", NULL, envir = baseenv())

来源：https://stackoverflow.com/questions/5725106/r-how-to-clear-all-warnings