Henrik

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Henrik has asked 17 questions and find answers to 383 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

Detect and correct grouping variables with more than one repetition of a time sequence
Creating an indicator variable using partial string matching
Calculations within subsets of dataframe [R]
How to fill data frames in a manner dependent on values in other rows and columns in R
Creating a matrix using recycling
Ordering bars in barplot()
Two column x-axis in ggplot2 (group by first, specify second) [duplicate]
r data.table: aggregating the grouping column inconsistency
Select previous and next N rows with the same value as a certain row
Force R to write scientific notations as n.nn x 10^-n with superscript