[R] Equivalent of 'Retain' statement in R

[Peter Dalgaard]

Shubha Vishwanath Karanth wrote:
> What is the equivalent keyword for 'retain' statement of SAS in R?
>
>   
There is none. This is strongly linked to the sequential operation of
the DATA step i SAS and R just does things differently. The lag()
function sometimes helps, but you may need an explicit for() loop, or
rethink the operation in vectorized terms.

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