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New posts in data-manipulation

R: create a data frame out of a rolling window

r data-manipulation data-management rolling-computation

Aggregate one data frame by time intervals from another data frame

r data.table aggregate plyr data-manipulation

dplyr's filter function: how to return every value (or «cancel» the effect of filter)?

r dplyr data-manipulation

R: Extracting Rules from a Decision Tree

r tree data-manipulation prediction decision-tree

Split a data frame into overlapping dataframes

r dataframe data-manipulation data-management

Search and replace string in a very big file

json perl awk large-files data-manipulation

pandas merge on date column issue

python pandas merge data-manipulation

data.table or dplyr - data manipulation

r data.table plyr data-manipulation dplyr

Split pandas dataframe column based on number of digits

python pandas dataframe data-manipulation

Efficiently center a large matrix in R

r center data-manipulation

Number of firms per year using dplyr or datatable

r data.table dplyr data-manipulation

Can I access an object in C++ other than using an expression?

c++ expression language-lawyer data-manipulation

Select nth element from multidimensional JSON array with jq

json command-line data-manipulation jq

Create a variable capturing the most frequent occurence by group

r count frequency data-manipulation data-management

How do you handle the fetchxml result data?

xml data-structures dynamics-crm data-manipulation fetchxml

Pivot cateorical values into boolean columns SQL

sql tsql pivot sql-server-2012 data-manipulation

Cumulative Sum of a division with varying denominators R

r data.table dplyr data-manipulation

Postgres: convert single row to multiple rows (unpivot)

sql database postgresql data-manipulation unpivot

Generating a moving sum variable in R

r data-manipulation

Fast way to split string and convert to long format in data.table

r substring data.table data-manipulation
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