Arun

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Arun has asked 18 questions and find answers to 653 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

R data.table ordered column lookup
generate sequence of numbers in R according to other variables
Error reading Field with Double Quotes and Commas using Fread
colnames being dropped in data table in R [duplicate]
Using 'fastmatch' package in R
How can I improve the performance of my data cleaning code that currently uses ddply by using data.table?
Subset multiple columns by .N in large data.table
setDT() is not adding additional columns
How to efficiently add an order variable to a big data frame
Can data.table handle identical column names when using .SDcols?