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Stack Exchange

Uwe Block

Interested in interactive data visualisation, R, shiny, RStudio, data.table, creating packages, git, ...

I owe so much to the community for what I've learned from others I want to return something if possible.

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Top Questions
Top Answers
60
Split comma-separated strings in a column into separate rows
stackoverflow.com

40
Reverse stacked bar order
stackoverflow.com

40
How to choose variable to display in tooltip when using ggplotly?
stackoverflow.com

21
How to maintain size of ggplot with long labels
stackoverflow.com

19
Transform year/week to date object
stackoverflow.com

16
Cleaning up factor levels (collapsing multiple levels/labels)
stackoverflow.com

14
How to force specific order of the variables on the X axis?
stackoverflow.com

14
How to apply a function to a subset of data.table using by and exposing all columns to the function?
stackoverflow.com

12
dynamic ggplot layers in shiny with nearPoints()
stackoverflow.com

10
data.table in R - multiple filters using multiple keys - binary search
stackoverflow.com

10
Error with R dplyr left_join
stackoverflow.com

10
How do I arrange a variable list of plots using grid.arrange?
stackoverflow.com

10
Why are my functions on lubridate dates so slow?
stackoverflow.com

10
Efficiently convert a date column in data.table
stackoverflow.com

9
Find overlapping dates for each ID and create a new row for the overlap
stackoverflow.com

9
better string interpolation in R
stackoverflow.com

8
Unique in data.table dropped some value by mistake
stackoverflow.com

8
R data.table: mean for many columns
stackoverflow.com

8
Pasting two vectors with combinations of all vectors' elements
stackoverflow.com

8
Nested ifelse statement
stackoverflow.com

8
Filtering rows in a dataset by columns
stackoverflow.com

8
R data.table sum of group subset using dates
stackoverflow.com

7
Convert four digit year values to a date type
stackoverflow.com

7
Join tables based on multiple ranges in R
stackoverflow.com

7
ggplot bar plot with facet-dependent order of categories
stackoverflow.com

7
How to Add Data Labels to ggplot
stackoverflow.com

7
R force local scope
stackoverflow.com

7
Using dcast.data.table with date values and aggregation
stackoverflow.com

7
as.Date produces unexpected result in a sequence of week-based dates
stackoverflow.com

6
What is the fastest way to get a vector of sorted unique values from a data.table?
stackoverflow.com

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