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R Reshape Wide-to-Long without specifying stubs

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#r #data.table #melt
78
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How to create a sub-table of another table with specific column entries in R?

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#r #data.table #subset #subtable
27
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Create a new table with the percentage quantity amount of individual counterparties compared to the total quantity

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#r #sum #data.table #percentage
43
Views

Create a new data table with mean of specific column by quarters

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#r #data.table
74
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Replacing elements of column names with associated strings

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#r #data.table #r-colnames
27
Views

Rstudio monthly discount factor interpolation for data table

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#data.table #finance #discount
38
Views

How to loop data.table function through table

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#r #data.table
53
Views

Is there way to expand rows in a data frame by conditioning on two columns?

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#r #data.table #data-manipulation
52
Views

keep value when using data.table::fcase() instead of dplyr::case_when()

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#r #data.table
76
Views

Assitance optimizing a nested loop?

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#r #optimization #data.table #nested-loops
59
Views

data.table: Keep original column name when applying a function inside a 'by=variable' statement

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#r #data.table
134
Views

R: get function in a data.table with ifelse criteria

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#r #data.table
108
Views

data.table shift() in v1.15.2 not working when rows are subset in i by column - `DT[i == TRUE, (cols) := shift(), by = col]`

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#r #data.table
109
Views

Find correlation between *values* in columns

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#r #performance #data.table
30
Views

R data table group by and unique values

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#r #data.table #data-wrangling
108
Views

inverse selection for by in R data.table

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#r #data.table
38
Views

How to combine two melt / gather / pivot_longer commands in R into one command?

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#r #data.table #multiple-columns #reshape2 #melt
26
Views

dt_fill raises recycle error all of a sudden

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#data.table
96
Views

How to make lapply faster in a database with more than 30 millions rows?

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#r #database #parallel-processing #data.table #lapply
71
Views

data.table's GForce - Apply multiple functions to multiple columns (with optional arguments)

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#r #data.table

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