| filter_by_union | R Documentation | 
Select values from a data.frame df matching any column from another data.frame or a selection of row indices. If a second data frame and a selection of rows is provided, values from df matching any value in df2[rows, ] are returned. If only rows indices are provided, rows matching any value in df[rows, ] are returned. NAs are not matched.
This is a wrapper around dplyr::filter with if_any for the case where the value should be in a reference set, with the option to choose whether to use another data frame or a subset of rows as the reference.
filter_by_union(df, df2 = NULL, rows = NULL, by = NULL, verbose = TRUE)
| df | A data.frame from which to select matching rows | 
| df2 | Optional, a second data frame | 
| rows | Row indices for subsetting, either df2 if present or df | 
| by | = columns to select from df2 | 
| verbose | Print information about how tables are joined? (Default: TRUE) | 
Helen Lindsay
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