Frank

Frank has asked 19 questions and find answers to 426 problems.

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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

What is the easiest way to find the smallest interval that contains 90% of the values in an array using R?
Substitute previous row value if value equal to 0 in R
Drop columns when splitting data frame in R
lapply with nested list
Pass a list of columns to data.table’s CJ as a vector
Count combinations by column, order doesn't matter
R data.table i = MYVAR != %like% "something|somethingelse|somethingmore",
Apply which.min to data.table under a condition
Efficiently joining more than 2 data.tables
R data table: use function on group except current row