[R] shift and pop equivalent in R

[Duncan Murdoch]

On 20/04/2010 2:03 PM, Xie Chao wrote:
> Dear All,
>
> I am wondering is there any shift (or pop or push or unshift) equivalent in R?
> For example,
> shift(x)   # should return x[1], and x becomes x[-1]
>   

Not in base R.  Generally speaking, functions with side effects are 
frowned upon.  It is possible to write it yourself, but you need to 
watch out for weird cases like

shift(x + y)

where it's not at all clear what the side effect should be.

Duncan Murdoch
> Thanks a lot.
>
> Best Regards,
> Xie Chao
>
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