On Sep 16, 2009, at 6:03 PM, Peng Yu wrote:

Hi,

According to my understand of the description in R-intro, double quote
and single quote are the same. Can somebody confirm if this is the
case?

Not exactly. It might be more correct to say that matched double quotes are the "same as" matche single quotes. You cannot close an expression you started with a double-quote by using a single-quote:

> "test'
+ "
[1] "test'\n"

> 'test"
+ "
+ "
+ '
[1] "test\"\n\"\n\"\n"
>

--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT

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