is.* tests on a given object:
is.numeric, and many others.
any R object.
whether negative tests should be included in output.
A character vector containing positive tests, or when
TRUE, a data frame showing all test results.
The following procedure is used to look for valid tests:
Find all objects named
is.* in all loaded
Discard objects that are not functions.
Include test result only if it is of class
NA, and of length 1.
Arni Magnusson, inspired by
1 2 3 4
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