| 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.
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.
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