Frank

Frank has asked 20 questions and find answers to 520 problems.

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Frank questions

using return list macros with `: list' syntax
fill rows downward for a column with NAs (with R base or data.table)
splitting (1:n)[boolean] into contiguous sequences
accessing Y columns with duplicated names in j of X[Y, j] merges
print the data.table package's .onAttach messages with knitr
Clean, simple function factories in R
Using data.table's .() shortcut in quoted expressions
lapply-ing with the "$" function
Efficiently computing a linear combination of data.table columns
data.table `:=` assignment expressions with dynamic inputs (existing columns) and outputs (new column names)

Frank answers

combine two data frames or tibbles
Create new index / re-index in dplyr [duplicate]
Split data.table into roughly equal parts
Merger and partial addition of rows without groups in R
Apply a list of formulas to R data.table
Error: measure variables not found (data.table::melt)
Rolling count of exceedances by variable over time series in R
Rolling window pattern update in R
The fastest way to parse rules string into data.frame
how to lapply Filter