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chinsoon12

Rating
1493.44 (4,328,249th)
Reputation
9,481 (16,227th)
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Title Δ
data.table: How to change column values based on grouped unique row... -0.11
Function to group continuous variable in data.table 0.00
R data.table: Random sample of rows from second table by group +2.32
Create additional variable by condition in R -0.27
Calculate rolling functions on up to a time interval with irregular... +2.33
Sum of a variable based on two grouped variables - for the previous... 0.00
Permutations with data.table join +0.40
R - building new variables from sequenced data -1.10
add row based on variable condition in R -1.09
Cumulative average with conditions to update 0.00
Find the count of events preceding a given date that varies +2.35
Group-wise subsetting where feasible 0.00
Partial sorting of a vector -0.35
Faster way to achieve filtering for all possible combinations +0.49
Filling missing values based on a relationship with another table -0.49
Update column of dataframe1 based on column of dataframe2 + create... +0.05
What is the equivalent of mutate_at (dplyr) in data.table? -1.82
Subset and aggregate an original data.table based on a different co... +2.49
Combinatorics - Maximizing unique pairs including all elements from... 0.00
R data.table subsetting by column value +0.41
Aggregate results by date intervals in R 0.00
How to efficiently merge 2 dataframes on multiple columns and on mu... -0.50
convert lists of values in a string, separated by two different del... -1.76
finding nearest occurrence of timestamp in a column based on condit... -1.68
Why there appear three NA's at the end? 0.00
How to reduce aligned sequences to start and end coordinates? +2.38
R equivalent of update query with inner join and conditions 0.00
Passing multiple arguments to data.table inside a function -1.34
Append columns to data.table, sort and avoid setDT +0.49
How to efficiently count matches across a list in R? +1.38
How to replace values of multiple columns in data.table object? 0.00
Creating new factors using rollapply 0.00
Cartesian joining half of a table with data.table 0.00
Efficient way to compute scores within data.table by group 0.00
Why does the := operator behave differently with different construc... -1.68
passing shiny variable to data.table 0.00
Merging specific rows into columns +0.20
conditional grouping by value and number of rows in R -0.48
Can last command executed be retrieved within an r script 0.00
ordered grouping of rows in R +0.31
Select i-th element if a condition occurs with for loop -0.04
subset data based on multiple conditions +2.54
Using functions of multiple columns in a data.frame (data.table) wi... -0.53
Time data populating in r 0.00
Repeatedly apply a conditional summary to groups in a dataframe +2.49
Perform for-loop inside data.table 0.00
How to improve efficiency when conditionally mutating multiple colu... -0.48
R: summing within different subgroups in data.table with auxiliary... -0.26
Replace N/As in a data.table join -1.87
What optimisation approaches are there for the current for-loop in R? +2.35