Jaap

Jaap has asked 13 questions and find answers to 323 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

Consolidate duplicate columns and concatenate column names
Adjust vector subset values according to certain rules
How to collapse all character vectors in a list
User defined parameters for ggplot2 geom_boxplot
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