Stack Exchange

Tommy

Seattle, WA

Computer science guy interested in software architecture, algorithms and performance. Special interest in the performance of dynamic languages such as R.

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Top Questions
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Top Answers
31
What's the difference between `1L` and `1`?
stackoverflow.com

28
Is R's apply family more than syntactic sugar?
stackoverflow.com

23
`levels<-`( What sorcery is this?
stackoverflow.com

20
How to test if list element exists?
stackoverflow.com

15
How to convert a matrix to a list in R?
stackoverflow.com

13
Repeat list object n times
stackoverflow.com

13
Import text file as single character string
stackoverflow.com

12
Why is the terminology of labels and levels in factors so weird?
stackoverflow.com

12
How to flatten a list to a list without coercion?
stackoverflow.com

12
is ifelse ever appropriate in a non-vectorized situation and vice-versa?
stackoverflow.com

12
A comprehensive survey of the types of things in R. 'mode' and 'class' and 'typeof' are insufficient
stackoverflow.com

12
Why is R slow on this random permutation function?
stackoverflow.com

11
How to sort letters in a string in R?
stackoverflow.com

11
Why does sapply() return a list?
stackoverflow.com

11
Performance differences between ATLAS and MKL?
scicomp.stackexchange.com

10
What's the biggest R-gotcha you've run across?
stackoverflow.com

10
R: Getting attribute values as a vector
stackoverflow.com

10
How do I round to 1, 1.5, 2 etc instead of 1, 2 or 1.1, 1.2, 1.3 in R?
stackoverflow.com

10
Why this is so slow? (loop in a DF row vs. a standalone vector)
stackoverflow.com

10
compress vector in (inverse of rep)
stackoverflow.com

9
How to round up to the nearest 10 (or 100 or X)?
stackoverflow.com

9
Finding local maxima and minima
stackoverflow.com

9
Split column at delimiter in data frame
stackoverflow.com

9
How to save all console output to file in R?
stackoverflow.com

9
Position in vector based on approximate matching
stackoverflow.com

9
switch() statement usage
stackoverflow.com

9
Same Random Numbers Every Time
stackoverflow.com

9
do.call in combination with “::”
stackoverflow.com

9
Tips for golfing in R?
codegolf.stackexchange.com

8
Identical data frames with different digests in R?
stackoverflow.com

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