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Frank

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1617.40 (1,172nd) 		Reputation
57,070 (1,677th)
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Title Δ
Filtering from changing set in dplyr / data.table instead of for loop 0.00
Merge 2 dataframes with conditions on datetimes and get the counts... 0.00
Combining "by" and "on" to join and create summ... +1.36
Identify jumps from 0 to 1 using data.table +1.24
Replace the first number of each group/factor with new value +0.83
R - assigning value to vector based upon matches to one of multiple... 0.00
Multiple regex match and assignment in data.table -0.19
Join then mutate using data.table without intermediate table 0.00
Substitute DT1.x with DT2.y when DT1.x and DT2.x match in R 0.00
Efficient way of taking the max date within groups +1.53
Subtracting single value across multiple data table rows with crite... 0.00
Quickly calculate number of One-way, Two-way links from very large... 0.00
Extracting rows defined by several factors with a large number of l... 0.00
Saving plots in a data.table list column 0.00
Faster coding than using for loop +1.09
Append data.table totals row through chain instead of rbindlist? 0.00
What is the preferred way to programmatically define multiple new d... 0.00
Use `j` to select the join column of `x` and all its non-join columns 0.00
Efficient data structure to store a string, an integer and a real n... 0.00
Transform longitudinal table to wide format efficiently in data.table 0.00
Why reassigning new name to dataframe in dplyr makes it faster? 0.00
Compare values from two dataframes and merge +1.56
Remove the first N rows from each factor level in an r data.frame +0.26
How to calculate new column depending on aggregate function on grou... 0.00
Aggregate if string contains specific text in R +0.16
Conditional Intersections in R +0.32
Filling "implied missing values" in a data frame that has... 0.00
data.table: lapply a function with multicolumn output 0.00
Set values greater than index to be NA, per row +2.16
Converting column names to row values based on conditional flags +0.19
First index of longest ordered portion of a vector 0.00
Randomly subset each group to satisfy conditions 0.00
What is the most efficient way to replace values in a data.table us... +2.02
Rolling count of exceedances by variable over time series in R +1.19
Finding closest matching time for each patient +1.16
The fastest way to parse rules string into data.frame +0.90
make combinations from one column of a data.table and sums from cor... +0.37
R: Interpolate a data.table when x's are the names of columns a... 0.00
Flexible mixing of multiple aggregations in data.table for differen... +1.27
R: insert NAs in one column when variable name in another column ch... 0.00
Drop rows in a data.table where columns do not change to the prior... +2.24
Subset time series so that selected rows differs by a certain minim... 0.00
Get column names when summarising a data table using multiple funct... 0.00
Sum column values based on multiple criteria in data table j 0.00
Map entries between two data.tables +2.25
R Find matches between a data.table of data and a data.table of ran... 0.00
non-equi joins adding all columns of range table in data.table in o... 0.00
Finding stationary distribution of a markov process given a transit... -1.89
R: calculate the number of occurrences of a specific event in the p... +1.25
Counting new values not occuring earlier and not occuring in last g... -0.59