eddi

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eddi has asked 48 questions and find answers to 403 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

Join two tables but fill common column
Summarise transactions fulfilling a criterion in a sliding window
fast crossproduct for recursive matrices
Find first date of two consecutive weeks with records in R (data.table)
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