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I came across this syntax while learning R and H2O, however I could not discern what

 := 

operator does in R.

Vishal R
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    This is not a base R operator. It is for the `data.table` package. Take a look at the documentation: `library(data.table); help(":=")`. – lmo Jun 10 '16 at 12:14
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    @lmo it actually is a(n undocumented) base R operator - if it wasn't `data.table` (and `ggplot2` and maybe other packages) wouldn't be able to use it as one. It just isn't used for anything in base R. – eddi Jun 10 '16 at 15:27

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