Print Warning Messages

Description

warnings prints the top-level variable last.warning in a pleasing form.

Usage

warnings(...)

Arguments

Details

See the decription of options("warn") for the circumstances under which there is a last.warning variable and warnings() is used. In essence this is if options(warn = 0) and warning has been called at least once.

It is possible that last.warning refers to the last recorded warning (possibly even in a previous session with a saved workspace), and not to the last warning, for example if options(warn) has been changed or if a catastrophic error occurred.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

See Also

warning.

Examples

## NB this example is intended to be pasted in,
##    rather than run by example()
ow <- options("warn")
for(w in -1:1) {
   options(warn = w); cat("\n warn =",w,"\n")
   for(i in 1:3) { cat(i,"..\n"); m <- matrix(1:7, 3,4) }
}
warnings()
options(ow) # reset