Henrik

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Henrik has asked 16 questions and find answers to 360 problems.

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Henrik questions

Expanding window (cumulative calculation) in data.table: how to improve performance
Subset a list - a plyr way?
Remove legend labels using label = FALSE in guide_legend, or labels = NULL in discrete_scale
Brew and knit one PDF report split by variable with special characters (å æ ø) - encoding issue
Parse dates in format dmy together with dmY using parse_date_time
Changing factor levels on a column with setattr is sensitive for how the column was created
Use `j` to select the join column of `x` and all its non-join columns
Align different plot shapes
How to avoid that anytime(<numeric>) "updates by reference"?
How is order determined in the result of a non-equi join?

Henrik answers

Group rows in data frame based on time difference between consecutive rows
Join data frames and select random row when there are multiple matches
Within-group operations in R (not rolling sum)
How can a data frame be transformed into a string with a csv format on R?
Get indices of matches with a column in a second data.table
Creating a histogram using aggregated data
In R & sf, how can I update coordinates of selected features?
Does R have a distinction between character vectors and strings?
Specifying colour, transparency and position of arrows (line segments) in ggbiplot
Can I fix overlapping dashed lines in a histogram in ggplot2?