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convert base plot to grob object
base2grob(x, envir = parent.frame())
grob object
expression or formula of base plot function call, e.g. expression(pie(1:5)) or ~plot(1:10, 1:10); or a function that plots to an R graphics device when called, e.g. function() plot(sqrt)
environment to search variables
Guangchuang Yu
base2grob(~plot(rnorm(10)))
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