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dplyr::filter nse
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| library(dplyr) | |
| library(lazyeval) | |
| Species <- "virginica" | |
| # The Species variable is interpreted | |
| # in the context of the data frame | |
| iris %>% | |
| filter_(Species == Species) %>% | |
| nrow() | |
| # 150 | |
| # The Species variable is interpreted | |
| # in the context of the global environment | |
| iris %>% | |
| filter_(interp(~Species == which_species, | |
| which_species = Species)) %>% | |
| nrow() | |
| # 50 |
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