修改R函数中的变量 [英] modify variable within R function
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问题描述
How do I modify an argument being passed to a function in R? In C++ this would be pass by reference.
g=4
abc <- function(x) {x<-5}
abc(g)
I would like g
to be set to 5.
解决方案
There are ways as @Dason showed, but really - you shouldn't!
The whole paradigm of R is to "pass by value". @Rory just posted the normal way to handle it - just return the modified value...
Environments are typically the only objects that can be passed by reference in R.
But lately new objects called reference classes have been added to R (they use environments). They can modify their values (but in a controlled way). You might want to look into using them if you really feel the need...
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