Jaap

Jaap has asked 13 questions and find answers to 353 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

How to visualize change in binary/categorical data over time?
R - customizing legend in ggplot2 to add geom_vline() component
How can I turn a part of the filename into a variable when reading multiple text files?
Adjusting graph bar height with ggplot2 [duplicate]
Increment count over rows with conditional restarting
How to reshape data for a stacked barchart using R lattice [duplicate]
Transpose list rows into a dataframe
Plot frequency table
data.table merge() with NA in by column
Loop through unique values of a column and create multiple columns