Jaap

Jaap has asked 13 questions and find answers to 334 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

Calculate amount of occurences for column per category
Grouping and Counting instances?
ggplot legend for colour with auxiliary variable
How to compare the two time intervals in R? [duplicate]
How to calculate time difference in consecutive rows
Find nearest value by group
How to tidy this dataset?
ggmap, using coord_cartesian pushes all points to the north
R cleaning csv file
Check condition and return name of column for which the condition is fulfilled