With selecting functions like
you can refer to variables by name:
mtcars %>% select(cyl, am, vs) mtcars %>% select(mpg:disp)
For historical reasons, it is also possible to refer an external vector of variable names. You get the correct result, but with a note informing you that selecting with an external variable is ambiguous because it is not clear whether you want a data frame column or an external object.
vars <- c("cyl", "am", "vs") result <- mtcars %>% select(vars)
This note will become a warning in the future, and then an error. We have decided to deprecate this particular approach to using external vectors because they introduce ambiguity. Imagine that the data frame contains a column with the same name as your external variable.
some_df <- mtcars some_df$vars <- 1:nrow(mtcars)
These are very different objects but it isn't a problem if the context
forces you to be specific about where to find
In a selection context however, the column wins:
some_df %>% select(vars)
To make your selection code more robust and silence the message, use
all_of() to force the external vector:
some_df %>% select(all_of(vars))
For more information or if you have comments about this, please see the Github issue tracking the deprecation process.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.