Henrik

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Henrik has asked 17 questions and find answers to 400 problems.

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Henrik questions

Do we need to convert single elements of j to a list when the overall result of j is a list anyway?
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"?

Henrik answers

tapply function complains that args are unequal length yet they appear to match
R - Specifying a desired row order for the output data.frame of aggregate()
Change direction of arrows in geom_spoke
Randomize non-diagonal elements of symmetric matrix
How can I add axis ticks for dates not present in my data using base R plot
Data management: flatten data with R
Order a data frame based on a column that points to the next record
Why indexing .SD with a number is faster than when the number is stored in a variable
How to connect several points from a fix point - R
How to averaging over a time period by hours?