Jaap

Jaap has asked 13 questions and find answers to 338 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

'position-aware' aligning of sequences with letter annotations
Repeat columns on a table according to name
Keeping maximum values on diagonals in matrix
sharing 2 data tables through sendmailR
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