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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
