Combine a list of data frames into one data frame by row

rr-faqlistdataframe
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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table

rassignment-operatorreferencecopydata.table
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How to implement coalesce efficiently in R

rcoalesce
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Subset data frame based on number of rows per group

rr-faqdataframesubset
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Select rows from a data frame based on values in a vector

rr-faqsubset
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