r - R 值传递或引用传递

Question

如果我在 R 中创建一个函数，例如：

f<-function(x){
x
.....

}

执行函数 R 时使用按值传递或按引用传递

标签： rpass-by-referencepass-by-value

Answer 1

In R it is call by value. To prove this i tried with a small function as below;

f1 <- function(a,b){

  print(a)

  #print b value before call
  print(b)

  fi(b)
  #print b value after call
  print(b)

}

fi <- function(i){
   i = i + 20
}

f1(10,20)

output :
----------
[1] 10
[1] 20
[1] 20