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Frank

Rating
1617.40 (1,172nd) 		Reputation
57,070 (1,677th)
Page: 1 2 3 4 5 ... 28
Title Δ
Max by Group with Condition for a data.table -1.74
dplyr group_by over elements of two columns -2.51
force .GRP counter to start from 2 instead of 1 in data.table -0.19
Get non-zero values from string in R -2.71
Remove ID if any consecutive values does not meet threshold -1.85
Create a unique name from non-unique names within id groups +0.68
data.table equivalent of tidyr::complete with group_by with on and... +0.10
Subsetting a data.table in a for loop is slower and resource hungry +1.26
data.table: Assign a column value where the column is specified by... +1.65
How do I reference the entire row when creating a new column in a d... +0.58
Which data.table syntax for left join (one column) to prefer 0.00
How to create a unique list of combinations from multiple vectors? +0.71
How to apply a table to several columns with data.table? +1.04
Aggregating a column by the same column 0.00
R - fuzzy join on nearest integer only -1.16
Assignment in data.table using `:=` has inconsistent behaviour 0.00
Operation along the same column given a logical condition -0.49
Conditionally Select Rows within a Group with Data.Table -0.91
Inner Join data.table without unwanted column(s) +0.07
Maximum difference in headings per group 0.00
How to roll sum by conditon? 0.00
Conditional setdiff (all-to-all) on two columns from two dataframes... -1.43
How to compose a list of functions +1.00
Rolling mean (varying lag) 0.00
Filtering out ID's between specified date ranges 0.00
How to extract first n rows per group and calculate function using... +1.30
Map One data.frame to another -1.18
Merge R data frame or data table and overwrite values of multiple c... -0.19
Group observations into specified number of groups according to id... +0.36
Matching Records in R based on Column Difference -0.53
Replace Inf/-Inf values from vector of variable names, with values... -0.69
Fast list generation from the narrow data.frame 0.00
Find min value among rows including and below given row by group 0.00
Rearranging Table in R -0.69
sequence events consistent with a two-column table of connections +1.00
Reshape but expand the data in R -0.19
Copy value into n previous cells of column in dataframe based on ID... +2.02
Subtracting the response of the "control" to all other gr... -0.73
Merge two database based on values between other values -2.34
Merger and partial addition of rows without groups in R -1.08
Take first non-0 value or last 0 value if that's all there is +1.09
find the nearest previous negative value in a column +0.33
Take first event from long file and transform to wide file -0.72
Return number of rows from dplyr filter +0.31
merging two dataframes based on one column without duplicating rows... +0.32
How to sort a data.table based on a set of inequality constraints? +1.77
How to create conditionally new groups when summarizing group means... 0.00
Converting dplyr to data.table +0.07
Assign unique ID per multiple columns of data table +1.27
R transform a list into pairs of successive elements 0.00