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Add labeller example for optional argument. Fixes #5916 (#6038)
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R/labeller.R

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@@ -83,6 +83,9 @@
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#' # Interpreting the labels as plotmath expressions
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#' p + facet_grid(. ~ cyl2)
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#' p + facet_grid(. ~ cyl2, labeller = label_parsed)
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#'
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#' # Include optional argument in label function
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#' p + facet_grid(. ~ cyl, labeller = function(x) label_both(x, sep = "="))
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#' }
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#' @name labellers
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man/labellers.Rd

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