Jaap

Jaap has asked 13 questions and find answers to 373 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

R merge.data.frame: probabilistic result for ambiguous keys
How to look for uniques in other column relatively assign ids
How to get fwrite() not to double quotes?
Set new column value based on TRUE/FALSE derived from existing columns
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?