>>>>> "PD" == Peter Dalgaard <[EMAIL PROTECTED]>
>>>>> on 29 Jun 2006 12:18:13 +0200 writes:
PD> "BXC (Bendix Carstensen)" <[EMAIL PROTECTED]> writes:
PD>
PD> > The function addmargins() adds margins to a table, but returns a matrix.
PD> > But even after converted to a table the print.zero="." option of
PD> > print.table() does not work:
PD> >
PD> > > x <- sample( 1:7, 20, replace=T )
PD> > > y <- sample( 1:7, 20, replace=T )
PD> > > tt <- table( x, y )
PD> > > tx <- as.table( addmargins( table( x, y ) ) )
PD> > > print( tt, zero.print="." )
PD> > y
PD> > x 1 2 3 4 5 6 7
PD> > 1 1 2 2 . . 1 .
PD> > 2 1 . . 1 . . .
PD> > 3 . . . . . . 2
PD> > 4 1 . . . . 1 .
PD> > 5 1 . 1 . . 1 .
PD> > 6 . 1 . 1 . . .
PD> > 7 . . 1 . 1 1 .
PD> > > print( tx, zero.print="." )
PD> > y
PD> > x 1 2 3 4 5 6 7 Sum
PD> > 1 1 2 2 0 0 1 0 6
PD> > 2 1 0 0 1 0 0 0 2
PD> > 3 0 0 0 0 0 0 2 2
PD> > 4 1 0 0 0 0 1 0 2
PD> > 5 1 0 1 0 0 1 0 3
PD> > 6 0 1 0 1 0 0 0 2
PD> > 7 0 0 1 0 1 1 0 3
PD> > Sum 4 3 4 2 1 4 2 20
PD> >
PD> > Is this a facility of print.table?
PD> > The attributes() of tt and tx have identical stucture.
PD>
PD> It appears to be intentional.
PD>
PD> print.table has
PD>
PD> if (is.integer(x) && zero.print != "0" && any(i0 <- !ina &
PD> x == 0))
PD> xx[i0] <- sub("0", zero.print, xx[i0])
PD>
PD> and of course,
PD>
PD> > storage.mode(tx)
PD> [1] "double"
PD> > storage.mode(tt)
PD> [1] "integer"
PD>
PD> The reason could be that it is not entirely clear what to expect for
PD> values that are zero up to round-off.
PD>
PD> storage.mode(tx) <- "integer" fixes things up.
On the other hand, I'm pretty sure I was the one who added
'zero.print' and I don't oppose at all to change
is.integer(x) to all(x == round(x))
{and then for efficiency swap the *order* of the tests inside that if(.)}
which I think would be a bit more convenient and still ok (*)
here.
Martin Maechler, ETH Zurich
(*) yes, one could then construct artificial cases where the
if(.) test would ``conceptually'' be wrong, but I think that
would not matter for all practical cases.
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