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Top Questions
22
votes
Simultaneously access environment from two R sessions
r
shiny
r6
asked Jul 8, 2015 at 18:50
stackoverflow.com
18
votes
Sub-assign by reference on vector in R
r
data.table
r6
asked May 20, 2015 at 8:26
stackoverflow.com
18
votes
Adaptive moving average - top performance in R
r
data.table
rolling-computation
moving-average
asked Jan 26, 2014 at 19:36
stackoverflow.com
18
votes
RStudio project and git repository in subdirectory
r
git
rstudio
devtools
asked Mar 12, 2015 at 22:38
stackoverflow.com
17
votes
raise a NOTE exception during R CMD check
r
cran
r-package
asked Feb 6, 2016 at 15:26
stackoverflow.com
14
votes
How to read feather/arrow file natively?
apache-spark
pyspark
pyarrow
apache-arrow
feather
asked Dec 1, 2018 at 9:49
stackoverflow.com
14
votes
R render Rd using roxygen2 without roxygen2 version
r
devtools
roxygen2
asked Apr 18, 2015 at 0:17
stackoverflow.com
14
votes
R vectorized array data manipulation
arrays
r
vector
matrix
asked Jun 19, 2013 at 22:24
stackoverflow.com
13
votes
Star schema, normalized dimensions, denormalized hierarchy level keys
data-modeling
data-warehouse
database-normalization
star-schema
data.cube
asked Feb 18, 2016 at 4:05
stackoverflow.com
13
votes
Query Postgres table by Block Range Index (BRIN) identifier directly
sql
postgresql
postgresql-9.5
asked Jan 16, 2016 at 11:24
stackoverflow.com
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Top Answers
98
How to join (merge) data frames (inner, outer, left, right)
stackoverflow.com
60
R install packages from Shell
stackoverflow.com
41
Grouping functions (tapply, by, aggregate) and the *apply family
stackoverflow.com
39
How to avoid warning when introducing NAs by coercion
stackoverflow.com
34
Read and write csv.gz file in R
stackoverflow.com
32
Fastest way to replace NAs in a large data.table
stackoverflow.com
32
Calculating moving average
stackoverflow.com
31
Is pandas now faster than data.table?
datascience.stackexchange.com
28
data.table merge by multiple columns
stackoverflow.com
25
Adaptive moving average - top performance in R
stackoverflow.com
24
How to order data within subgroups in data.table R
stackoverflow.com
22
R: data.table cross-join not working
stackoverflow.com
19
R xts and data.table
stackoverflow.com
19
Reorder rows in data.table in a specific order
stackoverflow.com
17
Manipulation of Large Files in R
stackoverflow.com
17
Aggregating sub totals and grand totals with data.table
stackoverflow.com
16
Use merge() to update a data frame with values from a second data frame
stackoverflow.com
13
data.table - summarizing data - difference between `by` and `keyby`?
stackoverflow.com
13
Why were pandas merges in python faster than data.table merges in R in 2012?
stackoverflow.com
13
How can one work fully generically in data.table in R with column names in variables
stackoverflow.com
12
How do I replace NA values with zeros in an R dataframe?
stackoverflow.com
12
apply multiple functions in sapply
stackoverflow.com
12
Replace NAs with mean of the same column of a data.table
stackoverflow.com
11
What are helpful optimizations in R for big data sets?
stackoverflow.com
10
R data.table join: SQL "select *" alike syntax in joined tables?
stackoverflow.com
10
Changing column names of a data frame
stackoverflow.com
10
Subset data table without using <-
stackoverflow.com
10
Efficiently counting non-NA elements in data.table
stackoverflow.com
9
Progress bar in data.table aggregate action
stackoverflow.com
9
How to do non-equi join with variable column name
stackoverflow.com
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