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 (1362)
Replies Last Post Views
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
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by Steve Harman
v1.6 has been submitted to CRAN by Matthew Dowle
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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
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by Matthew Dowle
aggregation error under 1.5.3 by Johann Hibschman-4
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by Matthew Dowle
prb with data.table by yoda55
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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
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by Matthew Dowle
Error inside [.data.table by Andreas Borg-2
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by Andreas Borg-2
How to speed up grouping time series, help please by Daniele Amberti-2
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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
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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
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by Matthew Dowle
Cox Proportional Hazard Model Problem by jono43
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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
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by Matthew Dowle
Making merge.data.table more like merge.data.frame, part II by Steve Lianoglou-6
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by Matthew Dowle
Adding the S4-ization patch by Steve Lianoglou-6
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by Matthew Dowle
Bug when by=key(DT) by Steve Lianoglou-6
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by Matthew Dowle
Have a patch for mere.data.table to take `suffixes` param like merge.data.frame by Steve Lianoglou-6
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by Short, Tom-2
How to use datatable in S4 class? by Peter Jackson
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by Steve Lianoglou-6
v1.5.3 has just been pushed to CRAN by Matthew Dowle
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by mbacou
data.table wiki by Matthew Dowle
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by Matthew Dowle
lapply on .SD example, and dropping names in functions by Matthew Dowle
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by Matthew Dowle
Question on inconsistent behavior by Damian Betebenner-2
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by Damian Betebenner-2
Re: using character vector as input argument to setkey (data.tablepakcage) by Matthew Dowle
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by Matthew Dowle
Joins in data.table by Harish-3
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by Matthew Dowle
Cannot access cols of y when doing x[y, ...] by pchalasani
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by Matthew Dowle
Fixed 'grp.1' annoyance when j returns a subset of .SD by Matthew Dowle
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by Matthew Dowle
Bug in merge for data.table? by Joseph Voelkel
4
by Joseph Voelkel
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