mark_first_in_each_group: Mark the first row in each group of rows.
In WinVector/FastBaseR: Fast grouped opertions in base R
Description
Usage
Arguments
Value
Examples
Description
Mark the first row in each group of rows.
Usage
1
mark_first_in_each_group(data, group_cols)
Arguments
data
a data.frame ordered with respect to groups
group_cols
character names of the grouping columns
Value
numeric vector with index of first row in each group
Examples
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d <- wrapr::build_frame(
"g", "v" |
1 , 1L |
0 , 2L |
0 , 3L |
1 , 4L |
1 , 5L )
d <- d[wrapr::orderv(d), , drop = FALSE]
d$fi <- mark_first_in_each_group(d, "g")
print(d)
WinVector/FastBaseR documentation built on May 21, 2019, 4:04 a.m.
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Description Usage Arguments Value Examples
Description
Mark the first row in each group of rows.
Usage
1 | mark_first_in_each_group(data, group_cols)
|
Arguments
data |
a data.frame ordered with respect to groups |
group_cols |
character names of the grouping columns |
Value
numeric vector with index of first row in each group
Examples
1 2 3 4 5 6 7 8 9 10 11 12 | d <- wrapr::build_frame(
"g", "v" |
1 , 1L |
0 , 2L |
0 , 3L |
1 , 4L |
1 , 5L )
d <- d[wrapr::orderv(d), , drop = FALSE]
d$fi <- mark_first_in_each_group(d, "g")
print(d)
|
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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