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Frank

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1617.40 (1,172nd) 		Reputation
57,070 (1,677th)
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Title Δ
Update a column values for a subset of rows in DT1 based on DT2 col... 0.00
R-Loop through data frame and count values greater than a value and... +1.20
replacing 0 with information of other column[dplyr] -1.12
Dummy variable conditioned on repetitions in grouped observations -0.21
correctly subset a list to replace element values -1.48
Specifying a default datatype for the columns of an empty data.table -1.78
Vectorisation of sequential computation steps in R 0.00
R data.table: use optimised mean() function in composite call? 0.00
R: find value >0 and check the sum of two consecutive values in... +0.33
how to insert a logical value based on a whether it has a previous... +0.32
Retrieve all possible combinations of n items, of a given size k an... +0.39
How to determine groups which fulfill certain condition for two con... +1.39
How do I create a new categorical variable from continuous multiple... -1.55
Mark a function as data.table-unaware -0.46
add a new grouping variable in dplyr -2.00
Subsetting a data.table with a variable (when varname identical to... -1.48
How to insert dates from one data frame into another? +0.31
How to define a run-length sequence with additional column condition -0.61
Merge 2 data frames by row and column overlap -2.55
Compare every group with every other group in data.table 0.00
Identification of new values cumulatively by groups in data.table i... +1.07
Conditional summing across data frames in R -0.20
creating new variable that takes into account prior information fro... +0.91
masking specific cell values in rows that meet condition +0.86
Finding rows of a large matrix that match specific values +0.30
Data.table - efficient evaluation of expression in "j" du... 0.00
using lead or lag from dplyr in combination with other variables +0.10
R Character classes 0.00
data.table cumulative stats of irregular observations with time win... +1.22
Return one variable based on match of another across groups in data... -0.27
How can I delete certain rows according to two columns which have s... +0.63
Apply if else function looping through 2 vectors to manipulate a da... -0.45
Subset data based on sequence of characters across rows +0.09
Remove duplicate rows conditionally within group_by in dplyr -0.32
Speed optimization - calculating weighted column in data.table with... -0.20
Changing values of data.frame where rowname == colname -2.58
non-equi-joins in R with data.table - backticked column name trouble 0.00
Empty value (NA) in file.path function displays extra slash character 0.00
filtering entire data frame based on a unique value and create a ne... +0.18
Filter data by threshold, including first value surpassing threshold 0.00
Clarification on Solution to Dynamically Subsetting A Data Table 0.00
How to create bin frequency table where bin size varies by group -2.84
Reshaping data in R with multiple variable levels - "aggregate... 0.00
Vectorizing a nested loop in R over a 3 dimensional array 0.00
How to rowSums by group vector in R? +0.34
Select first positive match per ID per date in R +0.25
Sampling by group without repetition using data.table +0.47
Replacing "NA" (NA string) with NA inplace data.table +0.74
Set values NA from first occurence of Pattern to end +1.40
R data.table key and secondary indexes compatibility 0.00