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Rating Stats for

Matt Dowle

Rating
1609.58 (1,416th) 		Reputation
48,330 (2,110th)
Page: 1 ... 4 5 6 7
Title Δ
Optimising a complex data.table aggregation in R 0.00
Collating data from a different column per row of a data.table, dep... -2.63
Throw away first and last n rows -3.46
Improving performance of updating contents of large data frame usin... -2.62
Improving performance of updating contents of large data frame usin... -2.62
Communicate between sessions 0.00
Translating SQL joins on foreign keys to R data.table syntax 0.00
"Loop through" data.table to calculate conditional averages +3.22
Using data.table i and j arguments in functions -0.06
Win64 compiling package from source: "sorry, unimplemented: 64... 0.00
R: selecting subset without copying 0.00
In R, is there a way to handle NA in an integer column of a data.fr... +0.30
Out of memory when modifying a big R data.frame +3.98
How to assign within apply family? 0.00
Make nested loops more efficient? -3.05
Cartogram + choropleth map in R -4.61
How to save a dataframe as an element of a list and vice versa? 0.00
Comparing rows between two matrices 0.00
Aggregating sub totals and grand totals with data.table 0.00
How to keep abreast of known bugs and bug fixes in R packages? 0.00
Named columns renaming +3.59
Get the column number in R given the column name +3.24
reshape throws error for data.table but not data.frame 0.00
Why are pandas merges in python faster than data.table merges in R? -4.39
R Methodology: Control and I/O between laptop R and large computati... 0.00
In R, How Do I Create a data.frame with Unique Values from One Colu... -4.12
Split dataframe using two columns of data and apply common transfor... -4.90
R Script - How to Continue Code Execution on Error 0.00
sort and output records with SAS and R +3.63
Timed exit from a shell command 0.00
Cumulative sum by group in sqldf? -0.38
How to install 2 different R versions on Debian? -4.53
r: for loop operation with nested indices runs super slow -4.42
Conditional replacement of values in a data.frame +1.10
summation of multiple columns grouped by multiple columns in R and... +3.08
How to select the first and last row within a grouping variable in... +4.61
Multiplication of large integers in R -4.82
How to expand a list with NULLs up to some length? +2.04
How to expand a list with NULLs up to some length? +2.04
No visible binding for global variable Note in R CMD check +3.70
Strange difference between x and get("x")? +4.51
first row for non-aggregate functions +3.46
How to match two data.frames with an inexact matching identifier (o... +5.30
Is my way of duplicating rows in data.table efficient? +2.84
R 2.14 - detect packages without namespace -2.71
paste method for a dataframe +3.62
non-joins with data.tables 0.00
add columns to data frame using foreach and %dopar% +3.40
efficient row-wise operations on a data.table +5.34
Porting set operations from R's data frames to data tables: How to... 0.00