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Rating Stats for

Matt Dowle

Rating
1609.58 (1,416th) 		Reputation
48,330 (2,110th)
Page: 1 2 3 4 5 6 7
Title Δ
Combine a list of data.tables +1.73
extracting segments of a data.table +0.41
reason for faster matrix allocation in R -0.58
Change internal function of a package +1.38
Is there a _fast_ way to run a rolling regression inside data.table? 0.00
Using aggregate for multiple aggregations -0.80
add multiple columns to subset of data.table with := 0.00
How to exclude one column from data.table OR convert to data.table... 0.00
time of data.table join 0.00
i argument in data.table (expression that evaluates to logical) 0.00
rolling joins data.table in R 0.00
Get the index for the last 1 for each row in a data table (R) 0.00
Aggregate data frame while keeping original order, in a simple manner +0.36
R data.table setkey with numeric column 0.00
assign multiple columns using := in data.table, by group 0.00
How to use an unknown number of key columns in a data.table -0.10
R data.table sliding window +0.15
setkey and the := operator, data.table, R 0.00
R data.table convert price to returns by criteria 0.00
Join data.table on exact date or if not the case on the nearest les... -1.38
split apply recombine, plyr, data.table in R +1.69
Subset data.table altering subset limit between factor levels 0.00
Subset and recombine dataframes using data.table package or other s... 0.00
Deleting columns of a data.table inside a function 0.00
Applying calculation per groups within R dataframe +0.15
How to best join one column of a data.table with another column of... 0.00
R row means on multiple columns by groups (or unique IDs) 0.00
Repeatedly sum a specific set of rows in data frame 0.00
`data.table` error: "reorder received irregular lengthed list&... 0.00
R object identity 0.00
passing name of dataframe into a loop in r 0.00
ddply with fixed number of rows -0.89
R removing time series with only zero values from a data frame +4.34
R efficiently removing missing values from the start and end of mul... +3.43
Allow a maximum number of entries when certain conditions apply -3.20
How to delete a row by reference in R data.table? +3.37
Count number of times data is in another dataframe in R +0.21
How do I speed up this _for_ loop? With data.table + lapply? 0.00
Select a value for based on a highest value in another column +3.35
R: using data.table := operations to calculate new columns 0.00
Rename one named column in R +3.20
R: importing data.table package namespace, unexplainable jump in me... 0.00
Joining two partial data tables, keeping all x and all y 0.00
Struggling with how to combine groups of rows in a data frame -5.12
R: loop over columns in data.table +4.77
Using data.table package inside my own package 0.00
Fastest way to add rows for missing values in a data.frame? +3.49
Why this is so slow? (loop in a DF row vs. a standalone vector) -4.09
compiling glmnet failed in windows 0.00
Understanding exactly when a data.table is a reference to (vs a cop... 0.00