Frank

United States

#SOreadytohelp

http://stackoverflow.com/questions/tagged/r%20or%20matlab%20or%20stata%20or%20sas%20or%20statistics%20or%20algorithm

^ a saved search for my own use

Huzzah: 12th to get the bronze data.table badge, and 8th to silver!

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Why is the diag function so slow? [in R 3.2.0 or earlier]

r matrix diagonal asked May 4, 2015 at 17:13

stackoverflow.com

18 votes

subsetting a data.table using !=<some non-NA> excludes NA too

r data.table asked Apr 25, 2013 at 18:10

stackoverflow.com

13 votes

Qual a diferença entre "mil" e "milhar"?

uso-de-palavras numeral asked Jul 15, 2015 at 0:00

portuguese.stackexchange.com

13 votes

Saving plots in a data.table list column

r plot graph data.table asked Feb 24, 2017 at 22:19

stackoverflow.com

11 votes

Usage of "estar com"

gramática verbo traducão-inglês asked Jul 16, 2015 at 2:42

portuguese.stackexchange.com

11 votes

Preventing Startopia visitors from walking in circles

startopia asked Apr 18, 2012 at 7:18

gaming.stackexchange.com

10 votes

A table mapping from US county or ZIP to Nielsen Designated Market Area (DMA)

data-request usa geospatial asked Dec 10, 2014 at 18:48

opendata.stackexchange.com

9 votes

Efficiently computing a linear combination of data.table columns

r performance linear-algebra data.table asked Oct 9, 2013 at 17:44

stackoverflow.com

8 votes

lapply-ing with the "$" function

r lapply asked Aug 13, 2013 at 18:02

stackoverflow.com

8 votes

Understanding different prepositions in "bater a/com a/na/à porta"

verbo traducão traducão-inglês preposicões asked Jul 16, 2015 at 2:01

portuguese.stackexchange.com

Top Answers

177

Apply a function to every specified column in a data.table and update by reference

stackoverflow.com

138

Select first and last row from grouped data

stackoverflow.com

Create a dataframe with random numbers in each column

stackoverflow.com

R: How to split a data frame into training, validation, and test sets?

stackoverflow.com

Replicating rows in data.table by column value

stackoverflow.com

Creating dummy variables in R data.table

stackoverflow.com

R dplyr: rename variables using string functions

stackoverflow.com

data.table equivalent of tidyr::complete()

stackoverflow.com

Efficient way to find repeated runs of rows, remove, & count

stackoverflow.com

Class of data.table column

stackoverflow.com

check whether all elements of a list are in equal in R

stackoverflow.com

Reorder rows in data.table in a specific order

stackoverflow.com

R sum element X in list of vector

stackoverflow.com

Which data.table syntax for left join (one column) to prefer

stackoverflow.com

Compare two character vectors in R

stackoverflow.com

How to declare list object with M elements

stackoverflow.com

Generate a sequence of numbers between values of vector

stackoverflow.com

Is there a way to `pipe through a list'?

stackoverflow.com

R data.table: subgroup weighted percent of group

stackoverflow.com

Find fastest way to get all intervals between identical elements in a vector

stackoverflow.com

how insert zeros in seq in R

stackoverflow.com

Extract only quarter from a date in r

stackoverflow.com

What exactly does sapply with '[' do?

stackoverflow.com

how to remove unique entry and keep duplicates in R

stackoverflow.com

Pass variable name as argument inside data.table

stackoverflow.com

Efficient way to find repeated runs of rows, remove, & count

stackoverflow.com

R View() does not display all columns of data frame

stackoverflow.com

Formattable based on multiple columns

stackoverflow.com

How to filter an R data.table by index and condition

stackoverflow.com

Access previous elements in lapply/sapply

stackoverflow.com