#
help()
?
demo()
example()
ifelse()
if
else
any
all
NA
NaN
NULL
[]
upper.tri()
lower.tri()
diag()
read.table()
read.csv()
scan()
apply
outer()
stack()
unstack()
reshape()
replace()
which()
sort()
rank()
order()
unique()
match()
%in%
strtrim()
substr()
strsplit()
summarize()
group_by()
filter()
arrange()
slice_min()
slice_max()
select()
mutate()
across()
plot()
par()
text()
points()
lines()
mtext()
axis()
matplot()
ggplot()
function()
closure
switch()
match.arg()
...
invisible()
for()
data
r
man
ui
server
plotOutput