Arun

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Arun has asked 18 questions and find answers to 692 problems.

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Arun questions

understanding optimisation messages on assignment by reference in a data.table
When does setting 'perl=TRUE' in 'strsplit' does not work (as intended or at all)?
Warning message: in rbindlist(allargs) : NAs introduced by coercion: possible bug in data.table?
unexpected output from aggregate
Using 'mutate_' to sum a bunch of columns row-wise
Why is subsetting on a "logical" type slower than subsetting on "numeric" type?
rbindlist two data.tables where one has factor and other has character type for a column
DT[!(x == .)] and DT[x != .] treat NA in x inconsistently
Why does "^" on a data.frame return a matrix instead of a data.frame like "*" does?

Arun answers

Events in last 21 days for every row by Name
big table processing (advice needed)
Deduplicating/collapsing records in an R dataframe
Benchmark analysis and display results of analysis AND benchmark?
Range join data.frames - specific date column with date ranges/intervals in R
How to extract a string that both matches some pattern and rests between two other strings
fread not recognizing a bare + or - as a character field
Inequality based conditional cumulative sum in R
Merge a data.table with ranges (intervals) with another with single values [duplicate]
Split a list of data.frames into sublists of data.frames