Jaap

Jaap has asked 13 questions and find answers to 319 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

Multiply cell in dataframe based on character
Count rows in second data table based on column values of first without merging
Character-location identity to create a new variable
remove legend entries and facets when all data are NA
How to calculate mean value of two list for each row
Conditional replacement of string with another string
Remove grouping variable for data.table
Modifying ggplot2 Y axis to use integers without enforcing an upper limit [duplicate]
Plot different distributions over histogram with ggplot
R ggplot2 discrete colour palette for gradient map