eddi

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eddi has asked 48 questions and find answers to 399 problems.

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eddi questions

boost exceptions in a shared library
R vs sed regex greediness
eval and substitute in C/C++
data.table join and j-expression unexpected behavior
fast conversion from string time to milliseconds
constructing an identifier string for each row in data
can I switch the grouping variable in a single dplyr statement?
initializer list constructor error with CRTP
how can I mutate in dplyr without losing order?
display only plotted data in the legend

eddi answers

How to use data.table to determine a value using a cumulive comparison
Condensing multiple observations on the same individual into a single row, adding multiples as new columns
r data.table function wrapper around ad-hoc join (with aggregation in a chain)
Last observation carried forward by group over multiple columns
Identify 3rd Friday in a sequence of Dates
Bi-weekly binning with data table
Fill matrix from list based on column name match from other list
data.table. Fast way to count number of changes within every column
R: Combining identical rows into one (preferably using dplyr/tidyr) [duplicate]
Row wise merge comma separated values in a `data.table`