Alex

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Alex has asked 67 questions and find answers to 44 problems.

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Alex questions

How to select the first n rows of each group in specified columns (after a join)?
Union All of SQL temporary tables created using dplyr?
Filter window with dplyr: find matching row, and keep subsequent N rows
Return root domain from url in R
Reorder columns in a 'canonical' way after mutate_each or summarise_each
Subsetting vector: how to programatically pass negative index safely?
Explicit formula used in linear regression
How do I label plot tick marks using ggvis
Correlation of subsets of dataframe using aggregate
How to handle pipes producing empty data further down the dplyr pipeline

Alex answers

Need to count the number of times a threshold value is met (or exceeded) per year (using R)
Union All of SQL temporary tables created using dplyr?
Compute difference between columns and save results in a new one using dplyr
Why does this code double transpose a vector - is this a noop?
Function name in single quotation marks in R
How do I see the help for the `dplyr::collect` method?
Is there any authoritative documentation on R release nicknames?
Is there a dplyr equivalent to data.table::rleid?
Gather multiple sets of columns
Function to split a matrix into sub-matrices in R