[R] source() behavior I don't understand

[jim holtman]

Put 'print' around your variable:

> temp.ttt <- "ttt <- 1\nprint(ttt)"
> conn.ttt <- textConnection(temp.ttt)
> source(conn.ttt, echo=TRUE)  ## name of variable is echoed

> ttt <- 1

> print(ttt)
[1] 1
> close(conn.ttt)
> cat(file="c:/temp/temp.R", temp.ttt)  ## name of variable not echoed
> source("c:/temp/temp.R", echo=TRUE)

> ttt <- 1

> print(ttt)
[1] 1
>
>
> temp.abc <- "abc <- 1\nprint(abc)"
> conn.abc <- textConnection(temp.abc)
> source(conn.abc, echo=TRUE)  ## name of variable is echoed

> abc <- 1

> print(abc)
[1] 1
> close(conn.abc)
> cat(file="c:/temp/temp.R", temp.abc)  ## name of variable is echoed
> source("c:/temp/temp.R", echo=TRUE)

> abc <- 1

> print(abc)
[1] 1
>


On Sun, Mar 9, 2008 at 9:01 PM, Richard M. Heiberger <rmh at temple.edu> wrote:
> temp.ttt <- "ttt <- 1\nttt"
> conn.ttt <- textConnection(temp.ttt)
> source(conn.ttt, echo=TRUE)  ## name of variable is echoed
> close(conn.ttt)
> cat(file="c:/temp/temp.R", temp.ttt)  ## name of variable not echoed
> source("c:/temp/temp.R", echo=TRUE)
>
>
> temp.abc <- "abc <- 1\nabc"
> conn.abc <- textConnection(temp.abc)
> source(conn.abc, echo=TRUE)  ## name of variable is echoed
> close(conn.abc)
> cat(file="c:/temp/temp.R", temp.abc)  ## name of variable is echoed
> source("c:/temp/temp.R", echo=TRUE)
>
>
> The behavior I don't understand is why the variable name "ttt" is not echoed
> when sourced from a file.  It is echoed when sourced from a character string.
> The name is echoed in both situations when it begins with a letter other
> than "t".  Specifically I have tested "tt" and "ttt".
>
> I am using R-2.6.1 on Windows.
>
> Rich
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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