Arun

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Arun has asked 19 questions and find answers to 715 problems.

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Arun questions

Efficiently joining over interval ranges in SQL
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

Concatenate vector elements in groups
Check of microbenchmark results fails with data.table changed by reference
What is a concise and clear idiom for mapping values into a data.table
Reshape from long to wide data format and matching start to end date pairs in R
R: Grouping levels of a factor across multiple files
plot overlapping positions from different files in R
Shift a column of lists in data.table by group
R - merge and update primary dataset [duplicate]
Missing legend when combining scale_fill_manual and scale_x_discrete in bar chart
Retrieve only top % of sub group in a data.frame