Jaap

Jaap has asked 13 questions and find answers to 369 problems.

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My data.table-tutorial files.

Jaap questions

How do I connect the endpoint & startpoint of geom_line in a polar plot (coord_polar)?
How to prevent data.table to force numeric variables into character variables without manually specifying these?
Odd behavior when joining with multiple conditions
Melt a dataframe by pattern in colnames
Replace empty values with value from other column in a dataframe
How to extract keywords from Google search results page URL?
How to fill geom_polygon with different colors above and below y = 0?

Jaap answers

How to add new column from list column value
Split a data frame and sort the splitted values based on a particular column
Improved Mosaic Plot (like Heatmap or bubbles)
ggplot stat_smooth: change look of multiple bands
How to vectorize modulo?
How to add seasonal dummy variables?
Replicate each row and change one column into binary values
Can I access the row index for a function used in apply()
Modify dates in POSIXct format in R using lubridate
Merging rows with the same ID variable [duplicate]