Jaap

Jaap has asked 13 questions and find answers to 342 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

Match data to nearest time value by id
data.table remove rows based on lag value by group
Select previous and next N rows with the same value as a certain row
Using case_when and between with a correspondance threshold table
'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?