[R] source(echo=TRUE) bug (was: source() behavior I don't understand)

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Sun, 09 Mar 2008 22:14:39 -0400

On 09/03/2008 10:01 PM, Richard M. Heiberger 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".

Looks like a bug in a regular expression. R doesn't echo lines containing nothing but blanks and tabs, and I think the regular expression that is supposed to match tabs is matching t instead. Thanks for the report, I'll fix it.

Duncan Murdoch



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