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datatable-help

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Questions and discussion about the data.table package in R. The package extends data.frame to provide keys, fast grouping, fast extract and fast joins in a short and flexible syntax.
data.table's homepage is here.
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Topics (1373)
Replies Last Post Views
unique by Damian Betebenner-2
3
by Matthew Dowle
indexing with NA i by Johann Hibschman-4
2
by Matthew Dowle
Reading corrupt csv and replace wrong value by DanMik
2
by cybaea
Error: variable lengths differ by Daniele Gentile
0
by Daniele Gentile
missing values- error message by DOCMAA
0
by DOCMAA
misc join questions by Johann Hibschman-4
6
by Matthew Dowle
Plot rows of CSV by rmje
1
by rmje
Data entry error in R Urgent by Carlosmagno
0
by Carlosmagno
Incrementing number in j-expression to get group index fails (bug?) by Andreas Borg-2
4
by Matthew Dowle
Select only group columns (by supplied but not j) by Andreas Borg-2
2
by Andreas Borg-2
data.table - grouping character values by Nicolas Servant
7
by Matthew Dowle
NIR-data import and PLSR by Roberto
0
by Roberto
Grouping with sort by Steve Harman
4
by Matthew Dowle
Re: keys that dont match by Santosh Srinivas
4
by Matthew Dowle
using paste function while grouping gives strange results by Steve Harman
7
by Steve Harman
v1.6 has been submitted to CRAN by Matthew Dowle
0
by Matthew Dowle
Re: Column names after self join by Matthew Dowle
3
by Matthew Dowle
data.table by versus apply by Damian Betebenner-2
2
by Matthew Dowle
aggregation error under 1.5.3 by Johann Hibschman-4
4
by Matthew Dowle
prb with data.table by yoda55
0
by yoda55
Using a data.table to perform a two-way lookup by Karl Ove Hufthammer
9
by Matthew Dowle
Help with using roll = TRUE ... need some variation of VLOOKUP in excel with LOCF by Santosh Srinivas
7
by Matthew Dowle
Error inside [.data.table by Andreas Borg-2
2
by Andreas Borg-2
How to speed up grouping time series, help please by Daniele Amberti-2
6
by djmuseR
Data type unintentionally converting on data table on join by Santosh Srinivas
1
by Short, Tom-2
Mainting key columns after `transform` by Steve Lianoglou-6
1
by Matthew Dowle
data.table wiki has grown (a bit) by Matthew Dowle
1
by Santosh Srinivas
Fast first row of each group by Matthew Dowle
2
by Matthew Dowle
Cox Proportional Hazard Model Problem by jono43
0
by jono43
Something seems funky. I think with character-to-factor conversion for keys (?) by Steve Lianoglou-6
10
by Steve Lianoglou-6
Idea/feature request by Steve Lianoglou-6
2
by Steve Lianoglou-6
Puzzling issue by Damian Betebenner-2
1
by Matthew Dowle
Making merge.data.table more like merge.data.frame, part II by Steve Lianoglou-6
1
by Matthew Dowle
Adding the S4-ization patch by Steve Lianoglou-6
3
by Matthew Dowle
Bug when by=key(DT) by Steve Lianoglou-6
1
by Matthew Dowle
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