Description Usage Arguments Details See Also Examples
mutar
is literally the same function as [.DataFrame
and can be
used as interface to dplyr or data.table. Other functions here listed are a
convenience to mimic dplyr's syntax in a R CMD check
friendly way.
These functions can also be used with S4 data.frame(s) / data_frame(s) /
data.table(s). They will always try to preserve the input class.
1 2 3 4 5 6 7 |
x |
(DataFrame | data.frame) |
i |
(logical | numeric | integer | OneSidedFormula | TwoSidedFormula | FormulaList) see the examples. |
j |
(logical | character | TwoSidedFormula | FormulaList | function) character beginning with '^' are interpreted as regular expression |
... |
arbitrary number of args
|
by |
(character) variables to group by. by will be used to do transformations within groups. sby will collapse each group to one row. |
sby |
(character) variables to group by. by will be used to do transformations within groups. sby will collapse each group to one row. |
drop |
(ignored) never drops the class. |
expr |
(expression) any R expression that should be evaluated using data tables reference semantics on data transformations. |
The real workhorse of this interface is mutar
. All other functions
exist to ease the transition from dplyr.
OneSidedFormula
is always used for subsetting rows.
TwoSidedFormula
is used instead of name-value expressions. Instead of
writing x = 1
you simply write x ~ 1
.
FormulaList
can be used to repeat the same operation on different
columns. See more details in FL.
extract, DataFrame, FL
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | data("airquality")
airquality %>%
filtar(~Month > 4) %>%
mutar(meanWind ~ mean(Wind), by = "Month") %>%
sumar(meanWind ~ mean(Wind), by = "Month") %>%
extract("meanWind")
airquality %>%
sumar(
.n ~ mean(.n) | c("Wind", "Temp"),
by = "Month"
)
# Enable data.tables reference semantics with:
withReference({
x <- data.table::data.table(x = 1)
mutar(x, y ~ 2)
})
## Not run:
# Use dplyr as back-end:
options(dat.use.dplyr = TRUE)
x <- data.frame(x = 1)
mutar(x, y ~ dplyr::n())
## End(Not run)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.