I have always thought that typing the name of an object generated a call to
the print method for the object, however, (in 0.49) I redefined the generic
print method as
print <- function(x, ...)
{if (is.tframe(x)) UseMethod("print.tframe")
else UseMethod("print")
}
Now I have an object z which returns TRUE to is.tframe(z)
and> class(z)
[1] "ts" "tframe"
Then
> print(z)
[1] 1981.50 2006.25 4.00
But> z
Error: comparison is possible only for vector types
> traceback()
[1] "c(\"print.ts(structure(c(1981.5, 2006.25, 4), class =
c(\\\"ts\\\",
\\\"tframe\\\"\", "
[2] "c(\"print(structure(c(1981.5, 2006.25, 4), class =
c(\\\"ts\\\",
\\\"tframe\\\"\", "
This is generating a call to the class method print.ts rather than to
print.tframe.ts as is done when I use print(z). If my understanding that
typing the name of an object should generate a call to the print method for
the object then this is a bug. Otherwise, could someone please explain to me
what it does. Thanks.
Paul Gilbert
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