| % File src/library/methods/man/fixPrevious.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{fixPre1.8} |
| \alias{fixPre1.8} |
| \title{Fix Objects Saved from R Versions Previous to 1.8} |
| \description{ |
| Beginning with R version 1.8.0, the class of an object contains the |
| identification of the package in which the class is defined. The |
| function \code{fixPre1.8} fixes and re-assigns objects missing that information |
| (typically because they were loaded from a file saved with a previous |
| version of R.) |
| } |
| \usage{ |
| fixPre1.8(names, where) |
| } |
| \arguments{ |
| \item{names}{ Character vector of the names of all the objects to be |
| fixed and re-assigned.} |
| \item{where}{The environment from which to look for the objects, and |
| for class definitions. Defaults to the top environment of the |
| call to \code{fixPre1.8}, the global environment if the function |
| is used interactively.} |
| } |
| \details{ |
| The named object will be saved where it was found. Its class |
| attribute will be changed to the full form required by R 1.8; |
| otherwise, the contents of the object should be unchanged. |
| |
| Objects will be fixed and re-assigned only if all the following |
| conditions hold: |
| \enumerate{ |
| \item The named object exists. |
| \item It is from a defined class (not a basic datatype which |
| has no actual class attribute). |
| \item The object appears to be from an earlier version of R. |
| \item The class is currently defined. |
| \item The object is consistent with the current class definition. |
| } |
| If any condition except the second fails, a warning message is |
| generated. |
| |
| Note that \code{fixPre1.8} currently fixes \emph{only} the change in |
| class attributes. In particular, it will not fix binary versions of |
| packages installed with earlier versions of R if these use |
| incompatible features. Such packages must be re-installed from |
| source, which is the wise approach always when major version changes |
| occur in R. |
| |
| } |
| \value{ |
| The names of all the objects that were in fact re-assigned. |
| } |
| \keyword{classes} |
| \keyword{programming} |