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Wimpel has asked 5 questions and find answers to 56 problems.

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Wimpel questions

find column value and name based on minimum value in other column
Efficient way to subset data.table based on value in any of selected columns [duplicate]
R: Check if value from dataframe is within range other dataframe
remove vector-elements from vector

Wimpel answers

R: calculating time-at-risk by age
How to efficiently divide pairs into clusters such that each cluster contains all entries of a given set
Doing rowmean on list-columns in R
Rolling Calculation in R with condition
Combining Matrix row by row alternating
Is there some way to keep variable names from.SD+.SDcols together with non .SD variable names in data.table?
Sequence with multiple intervals
Select columns which has a specific value in data.table
How to detect "strikethrough" style from xlsx file in R
How to get previous two years max value in R