Questions tagged [data.table]

33

votes

1

answers

Is it possible to modify a data.frame in-place (destructively)?

r dataframe data.table

asked 2013-07-26T21:43:53.260

20

votes

2

answers

Keeping zero count combinations when aggregating with data.table

r data.table

asked 2013-05-13T10:05:10.877

22

votes

1

answers

data.table: using setkey with a column name variable

r data.table

asked 2013-05-02T20:17:22.237

8

votes

1

answers

How to “flatten” or “collapse” a 2D data frame into a 1D data frame in R?

r 2d dataframe data.table

asked 2013-04-25T17:07:25.540

28

votes

2

answers

How to select columns programmatically in a data.table?

r dataframe data.table

asked 2013-04-25T11:32:13.163

9

votes

1

answers

merging tables with different column names

r merge data.table

asked 2013-04-16T21:15:53.890

8

votes

2

answers

data.table bug, causing a segfault in R

r data.table

asked 2013-04-16T20:41:42.350

15

votes

3

answers

rbindlist two data.tables where one has factor and other has character type for a column

r data.table

asked 2013-04-10T18:41:33.943

9

votes

1

answers

Bad interpretation of #N/A using `fread`

r data.table

asked 2013-04-03T09:52:03.460

12

votes

1

answers

Slow memory leak in data.table when returning named lists in j (trying to reshape a data.table)

r data.table

asked 2013-03-27T03:39:34.207

15

votes

2

answers

How to self join a data.table on a condition

r join data.table

asked 2013-02-20T15:36:10.553

32

votes

1

answers

Using dynamic column names in `data.table`

r data.table

asked 2013-02-18T13:11:15.107

12

votes

2

answers

Why does lapply() not retain my data.table keys?

r data.table lapply

asked 2013-02-18T01:39:29.643

12

votes

4

answers

R Dynamically build "list" in data.table (or ddply)

r data.table plyr aggregation

asked 2013-02-06T04:29:53.850

10

votes

1

answers

Warning message: in rbindlist(allargs) : NAs introduced by coercion: possible bug in data.table?

r data.table

asked 2013-01-29T13:48:24.187

17

votes

1

answers

data.table fread function

r csv data.table

asked 2013-01-02T15:43:09.977

13

votes

2

answers

cast string directly to IDateTime

r datetime data.table

asked 2012-12-27T14:37:21.960

8

votes

3

answers

Fast melted data.table operations

r dataframe data.table aggregation reshape2

asked 2012-12-20T09:08:24.990

43

votes

2

answers

Writings functions (procedures) for data.table objects

r data.table

asked 2012-12-07T02:43:11.617

16

votes

1

answers

outer join data.table R

r data.table

asked 2012-11-21T12:20:34.277

12

votes

2

answers

data.table error when used through knitr, gWidgetsWWW

r data.table knitr gwidgets

asked 2012-10-28T02:55:38.023

9

votes

2

answers

merge data.table when the number of key columns are different

r merge data.table

asked 2012-10-16T18:07:14.513

150

votes

3

answers

Why does X[Y] join of data.tables not allow a full outer join, or a left join?

r join data.table

asked 2012-10-07T23:46:03.867

25

votes

2

answers

Select NA in a data.table in R

r select data.table missing-data na

asked 2012-09-28T19:27:14.290

20

votes

4

answers

Cartesian Product using data.table package

r data.table

asked 2012-09-07T16:12:32.100

8

votes

2

answers

data.table efficient alternative to grouped assignment as DT[ ,x:=f(y),by=z]?

r data.table

asked 2012-05-24T00:51:47.310

25

votes

7

answers

Group by multiple columns and sum other multiple columns

r grouping aggregate plyr data.table

asked 2011-11-21T13:38:06.307

11

votes

1

answers

Splitting a data.table with the by-operator: functions that return numeric values and/or NAs fail

r data.table

asked 2011-10-31T23:01:36.820

14

votes

3

answers

non-joins with data.tables

r data.table

asked 2011-10-27T18:39:39.470

20

votes

2

answers

Fastest way to subset - data.table vs. MySQL

mysql r rmysql data.table

asked 2011-07-06T01:30:30.770

Questions tagged data.table