[R] return value of {....}

[akshay kulkarni]

Dear members,
                             I have the following code:

> TB <- {x <- 3;y <- 5}
> TB
[1] 5

It is consistent with the documentation: For {, the result of the last expression evaluated. This has the visibility of the last evaluation.

But both x AND y are created, but the "return value" is y. How can this be advantageous for solving practical problems? Specifically, consider the following code:

F <- function(X) {  expr; expr2; { expr5; expr7}; expr8;expr10}

Both expr5 and expr7 are created, and are accessible by the code outside of the nested braces right? But the "return value" of the nested braces is expr7. So doesn't this mean that only expr7 should be accessible? Please help me entangle this (of course the return value of F is expr10, and all the other objects created by the preceding expressions are deleted. But expr5 is not, after the control passes outside of the nested braces!)

Thanking you,
Yours sincerely,
AKSHAY M KULKARNI

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