count_by: Count number of observations in a data.table summarized by a...
In fcocquemas/hfty.helpers: Helper functions (paths, input/output, cloud...)
count_by R Documentation
Count number of observations in a data.table summarized by a certain set of fields
Description
Count number of observations in a data.table summarized by a certain set of fields
Usage
count_by(dt, fields)
Arguments
dt
data.table to summarize
fields
string or vector of strings, sets of fields to summarize the observations by.
Use "-" between column names to summarize by multiple fields. Use a single "*" to return
the unconditional number of rows of the data.table
Examples
iris_dt <- as.data.table(iris)
count_by(iris_dt, c("*", "Species", "Species-Petal.Width"))
fcocquemas/hfty.helpers documentation built on Feb. 13, 2023, 7:25 a.m.
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| count_by | R Documentation |
Count number of observations in a data.table summarized by a certain set of fields
Description
Count number of observations in a data.table summarized by a certain set of fields
Usage
count_by(dt, fields)
Arguments
dt |
data.table to summarize |
fields |
string or vector of strings, sets of fields to summarize the observations by. Use "-" between column names to summarize by multiple fields. Use a single "*" to return the unconditional number of rows of the data.table |
Examples
iris_dt <- as.data.table(iris)
count_by(iris_dt, c("*", "Species", "Species-Petal.Width"))
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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