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The Description field is intended to be a (one paragraph) description of
what the package does and why it may be useful. Please add more details
about the package functionality and implemented methods in your
Description text.

If there are references describing the methods in your package, please
add these in the description field of your DESCRIPTION file in the form
authors (year) doi:...
authors (year, ISBN:...)
or if those are not available: https:...
with no space after 'doi:', 'https:' and angle brackets for
auto-linking. (If you want to add a title as well please put it in
quotes: "Title")

Please add \value to .Rd files regarding exported methods and explain
the functions results in the documentation. Please write about the
structure of the output (class) and also what the output means. (If a
function does not return a value, please document that too, e.g.
\value{No return value, called for side effects} or similar) -> Missing
Rd-tags:
paint-matrix.Rd: \value
paint-vector.Rd: \value

Please make sure that you do not change the user's par. If you really
have to do so within functions, please ensure with an immediate call
of on.exit() that the settings are reset when the function is exited.
e.g.:
...
oldpar <- par(no.readonly = TRUE) # code line i
on.exit(par(oldpar)) # code line i + 1
...
par(mfrow=c(2,2)) # somewhere after
...
If you're not familiar with the function, please check ?on.exit. This
function makes it possible to restore options before exiting a function
even if the function breaks. Therefore it needs to be called immediately
after the option change within a function.
-> R/matrix.R, R/vector.R