Henrik

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Henrik has asked 16 questions and find answers to 341 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 can I create a custom colour scale using ggplot2 and geom_tile?
Using scale_color with a variable of class date produces Error: as.Date.numeric(value) : 'origin' must be supplied
Plot timeseries as heatmap
End of previous quarter / last day of previous quarter
Subset data frame based on top N most frequent values in variable
Determine dynamic window width: efficient rolling count of values which satisfy a condition
Add a second to duplicated POSIXct dates
Subsetting a unbalanced panel dataset to have at least 2 consecutive observations in R
Extract an increasing subsequence
Find row-wise minimum and return value and its corresponding column name