The name supplied as x need not exist as an R object, in
which case a function with no arguments and an empty body is supplied
for editing.
Editing an R object may change it in ways other than are obvious: see
the comment under edit. See
edit.data.frame for changes that can occur when editing
a data frame or matrix.
## Assume 'my.fun' is a user defined function : fix(my.fun)
## now my.fun is changed## Also, fix(my.data.frame) # calls up data editor fix(my.data.frame, factor.mode="char") # use of ...