Arun

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Arun has asked 18 questions and find answers to 705 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

Numeric comparison during merge in R
How to programmatically create binary columns based on a categorical variable in data.table?
Split a data frame and sort the splitted values based on a particular column
How to make column out of several rows?
for loop through a list of data frames and save results in new data frame
How do you change the data table rolling join condition from weak inequality to strict inequality?
How to create a matrix of different format from a data frame in R?
conditional statements in data.table
Average and median of each n rows, for all columns of a dataframe, while keeping a datetime object as index
R-Operating on subset of columns from dataframe with ddply