Frank

Frank has asked 19 questions and find answers to 436 problems.

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"I mean, a horse is a horse of course, but who rides is important."

Frank questions

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)
Saving plots in a data.table list column

Frank answers

Elementwise median of list of matrices in R
Sibling network using data.table
Getting rid of wash out rows in R dataframe by group
New columns based off existing column and column located next to it
looping over variable names in R
How to find row indices where duplicated pairs exist
Conditional summing across columns with dplyr
R: Convert obscure table into matrix
Efficient functions over specific data.frame columns in a list of data.frames
For each `pop` get frequencies of the elements of `id`