Frank

Frank has asked 20 questions and find answers to 514 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

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
How to find (not replace) leading NAs, gaps, and final NAs in data.table columns by category
Calculation of failure rate and date time manipulation in R
Sub-indexing a list to apply a function in R
Vectorize loop with repeating indices
Random binary matrix with row and column sum constraints
Fill missing dates with previous value by group