Henrik

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Henrik has asked 16 questions and find answers to 364 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

How to assign list as observation in data table?
R: How to aggregate data but keep informations from non-aggregated columns?
Select first row in each contiguous run by group
overlay/superimpose grouped bar plots in ggplot2
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