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Matt Dowle

Rating
1609.58 (1,416th) 		Reputation
48,330 (2,110th)
Page: 1 2 3 4 5 ... 7
Title Δ
Why is data.table casting automatically when I assign all columns b... 0.00
data.table auto remove NA in by for mean function? 0.00
R data.table segfault when trying to update one column and create a... 0.00
fread protection stack overflow error 0.00
merge-like scenario with two data.tables -0.57
why "character is often preferred to factor" in data.tabl... 0.00
Join results in more than 2^31 rows (internal vecseq reached physic... +1.64
Error deleting factor column in empty data.table 0.00
Should data.table's CJ continue accommodating arguments with duplic... 0.00
What is the most efficient way to change the case of column names i... 0.00
Apply function on each cell in a column and add the result to a new... -0.63
DT[!(x == .)] and DT[x != .] treat NA in x inconsistently -0.84
subsetting a data.table using !=<some non-NA> excludes NA too -1.29
data.table does not play well with checkUsage 0.00
Performing Operations on a Subset Using Data Table +1.21
understanding optimisation messages on assignment by reference in a... 0.00
Summarize and Rank Data Frame -0.58
data.table::fread and Unbalanced " 0.00
Number of Unique Obs by Variable in a Data Table -0.85
Subsetting data.table by not head(key(DT),m), using binary search n... -2.09
Join R data.tables where key values are not exactly equal--combine... +2.05
Applying a function to each row of a data.table +0.89
What a good way to get in-memory cache with data.table -0.73
Slow memory leak in data.table when returning named lists in j (try... 0.00
Equivalent to sql cartesian query with data.table +0.35
data.table is not handling integer64 in by statement 0.00
merge.data.table with all=True introduces NA row. Is this correct? 0.00
How do you undo a setkey ordering in data.table? 0.00
How to find the last or next entry using R package data.table and r... -0.82
Potential problems from over-allocating truelength more than 1000 t... 0.00
R package compilation with dependency on data.table 0.00
reading strand (+, -) column with fread, data.table package 0.00
Strange output from fread when called from knitr +1.87
Getting a random internal selfref error in data.table for R 0.00
is.null does not work on null data.table in R [possible bug]? -0.37
R data.table slow aggregation when using .SD +2.45
knitr gets tricked by data.table `:=` assignment 0.00
Wrapping data.table using an evaluated call in a package 0.00
Reduce computing time for reshape +0.51
prevent data.table from rolling for more than a certain number of p... 0.00
How to self join a data.table on a condition +1.16
split data.table 0.00
Why does lapply() not retain my data.table keys? -2.36
How to handle columns of lists in data.table +1.98
data.table and parallel computing 0.00
`setattr` on `levels` preserving unwanted duplicates (R data.table) 0.00
column selection with a function in a j-environment +0.39
How to select R data.table rows based on substring match (a la SQL... +0.35
Warning message: in rbindlist(allargs) : NAs introduced by coercion... 0.00
How do I preserve combinations of variables that do not appear in t... 0.00