>>>>> Richard Cotton <richiero...@gmail.com>
>>>>> on Thu, 5 May 2016 09:37:42 +0300 writes:
> If you set the "digits17" control option in deparse, you get a lot of
> unnecessary space in the representation of complex numbers.
> > deparse(0 + 0i)
> [1] "0+0i"
> > deparse(0 + 0i, control = "digits17")
> [1] "0 + 0i"
> As far as I can tell, the logic for this comes from this piece of
> /src/main/deparse.c:
> if (TYPEOF(vector) == CPLXSXP && (d->opts & DIGITS16)) {
> Rcomplex z = COMPLEX(vector)[i];
> if (R_FINITE(z.r) && R_FINITE(z.i)) {
> snprintf(hex, 64, "%.17g + %17gi", z.r, z.i);
> strp = hex;
> } else
> strp = EncodeElement(vector, i, quote, '.');
> }
> I think this is a small bug, and that "%17gi" in the snprintf call
> ought to be "%.17gi".
> Also there shouldn't be any space around the plus sign for consistency
> with the non-digits17 option.
> Is this a real bug, or is it deliberate behaviour?
> --
> Regards,
> Richie
Thank you, Richie!
I agree it should be improved ...
actually, there is even another improvement, so we don't get things like
'2+-1i' but rather '2-1i'
(namely to use the '+' format modifier option for printf).
I have commited a change to R-devel (only, for now),
svn rev 70601 specifically.
Martin
--
Martin <maech...@stat.math.ethz.ch> http://stat.ethz.ch/people/maechler
Seminar für Statistik, ETH Zürich HG G 16 Rämistrasse 101
CH-8092 Zurich, SWITZERLAND
phone: +41-44-632-3408 fax: ...-1228 <><
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