| warnings {base} | R Documentation |
warnings and its print method print the
variable last.warning in a pleasing form.
warnings(...)
... |
arguments to be passed to |
See the description of options("warn") for the
circumstances under which there is a last.warning object 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 and not to the last warning, for example if options(warn) has
been changed or if a catastrophic error occurred.
an object of S3 class "warnings", basically a named
list.
It is undocumented where last.warning is stored nor that it is
visible, and this is subject to change.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
## 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
tail(warnings(), 2) # see the last two warnings only (via '[' method)