Arun

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Arun has asked 18 questions and find answers to 676 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

Convert CSV data to a matrix to a heatmap in R
IF THEN on a Dataframe in r with LAG
Convert long data frame into wide data frame
left outer join in R with conditions
data.table converts factors in `by` to underlying integer?
Plyr for generating forecasts
Percentage within category
R conditional filter
how to avoid an optimization warning in data.table
Calculate average temperature (derived from other dataset) over start and end date in same row