Jaap

Jaap has asked 13 questions and find answers to 384 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

Find rows with a sequence of consecutive column values
How to subset data for a specific column with ddply?
"Invalid .internal.selfref" warning NO CALLING list() INVOLVED
Correct parameters for the geom_line layer in ggplot2
Divide one column of data frame by condition from another column
Sum rows in data frame based on two columns [duplicate]
Get nth element of a vector inside a data.frame column for the whole column - R
Replace values in some rows based on other dataframe mapping
ggvis density plot with tooltip?
How to refer to a column of a data.table by its position, in a sum() statement