inwords generates and provides a verbal description
of a fast-and-frugal tree (FFT) from an FFTrees object.
When data remains unspecified, inwords will only look up x$trees$inwords.
When data is set to either "train" or "test", inwords first employs
fftrees_ffttowords to re-generate the verbal descriptions of FFTs in x.
inwords(x, data = NULL, tree = 1)An FFTrees object.
The type of data to which a tree is being applied (as character string "train" or "test").
Default: data = NULL will only look up x$trees$inwords.
The tree to display (as an integer).
A verbal description of an FFT (as a character string).
fftrees_ffttowords for converting FFTs into verbal descriptions;
print.FFTrees for printing FFTs;
plot.FFTrees for plotting FFTs;
summary.FFTrees for summarizing FFTs;
FFTrees for creating FFTs from and applying them to data.