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假设下面的数据帧ggvis多个可变的选项
mydata = data.frame(
date = seq.Date(from = as.Date('2012-01-01'),to = as.Date('2015-6-01'), 'months'),
name = 'a',
var1 = sample(seq(from = 0, to = 1000, by = 1), size = 42, replace = TRUE),
var2 = sample(seq(from = 0, to = 1000, by = 1), size = 42, replace = TRUE),
var3 = sample(seq(from = 0, to = 1000, by = 1), size = 42, replace = TRUE),
stringsAsFactors = FALSE)
在我目前的数据集我有更多的名字,我选择哪个ggvis应该选择列表打印,我想知道,如果它是可以选择哪些列代表(目前我只代表一个做y =〜var1)