update.formula and backticked colons
On Thu, Jul 30, 2009 at 2:28 PM, Sundar Dorai-Raj<sdorairaj at gmail.com> wrote:
I just noticed the following in update.formula and I'm wondering if this behavior is the intention of the developers. Here's an example: update(`a: b` ~ x, ~ . + y) Note now that the response has no backticks and is interpreted as a:b (i.e. ":" is now an operator). This is because in update.formula the call to terms.formula uses simplify = TRUE. I'm working with data that has a lot of colons in their names and for reporting purposes I don't want to use make.names to avoid this situation. I do have a solution which simply avoids using update.formula, but I wonder if the developers would consider removing the "simplify" argument and allow it to be passed through "...", which is currently ignored by update.formula. Alternatively, add a simplify=TRUE to the update.formula call, which can manually be set to FALSE by the user. I would love to hear any comments or criticisms of my findings. Thanks, --sundar
Forgot my version info
version
_ platform x86_64-unknown-linux-gnu arch x86_64 os linux-gnu system x86_64, linux-gnu status major 2 minor 9.1 year 2009 month 06 day 26 svn rev 48839 language R version.string R version 2.9.1 (2009-06-26)