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

From: Richard M. Heiberger <rmh_at_temple.edu>
Date: Sun, 09 Mar 2008 22:01:32 -0400 (EDT)


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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