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New posts in data.table
R: Days since last event per ID
Feb 20, 2026
r
data.table
time-series
Issue class coercion filtered R data.table ifelse, if_else, if ... else
Feb 18, 2026
r
data.table
lapply with two column arguments
Feb 18, 2026
r
data.table
lapply
Plotting a stacked bar chart with data table
Feb 19, 2026
r
ggplot2
data.table
How to dynamically use lapply in data.table?
Feb 19, 2026
r
data.table
apply
Update join: replace with values from a column with the same name
Feb 17, 2026
r
join
data.table
Summarize a data.table across multiple columns
Feb 18, 2026
r
data.table
Row operations on selected columns based on substring in data.table
Feb 17, 2026
r
data.table
rowwise
How to create a co-occurrence matrix calculated from combinations by ID/row in R?
Feb 16, 2026
r
dplyr
data.table
combinations
find-occurrences
Factor levels by group
Feb 17, 2026
r
syntax
data.table
refactoring
levels
Find nearest value by group
Feb 15, 2026
r
data.table
Remove all data matching ID if first row meets specific condition
Feb 15, 2026
r
data.table
Conditional keyed join/update _and_ update a flag column for matches
Feb 15, 2026
r
data.table
How to avoid redundant calculation within data.table?
Feb 16, 2026
r
data.table
How can I reshape my data.table efficiently
Feb 16, 2026
r
data.table
reshape
Why do I need to wrap `get` in a dummy function within a J `lapply` call?
Feb 15, 2026
r
data.table
lapply
Using colClasses and select arguments of fread simultaneously
Feb 16, 2026
r
data.table
R data.table fwrite to fread space delimiter and empties
Feb 15, 2026
r
data.table
Call the same function by varying parameters with tidyverse and apply family functions
Feb 14, 2026
r
data.table
tidyverse
R data.table return NA when using .I to get row number
Feb 15, 2026
r
data.table
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