Logical operations on brobs are not supported
The S4 group generic “Logic” appeared in R-2.4.0-patched.
Carrying out logical operations in this group will call
.Brob.logic(), which reports an error.
!”, is not part of this group: attempting to
negate a brob will not activate
.Brob.logic(); an “invalid
argument type” error is given instead.
Robin K. S. Hankin
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## Not run: !brob(10) ## End(Not run)