[Rd] format bug and patch
murdoch.duncan at gmail.com
Fri Aug 16 19:46:30 CEST 2013
On 13-08-15 6:07 PM, Aleksey Vorona wrote:
> Dear R-team,
> I've been using R for a while and decided to contribute some bug
> fixes. The first bug I tried to solve was
> I have attached a patch with the fix to the bug and would love to hear
> comments about its quality.
> Also, while testing this bug I found another related issue:
>> format(complex(real=10, imaginary=4), digits = 1);
>  "10+0i"
> I think this should've been "10+4i". I have entered this as a bug
> #15427. But a patch for formatComplex() would be a bigger change, than
> the patch for formatReal() I made. So, before I start, I would like to
> gauge your opinion.
> Do you agree it is a bug?
No, it is a somewhat questionable design, but not a bug. You asked for
1 significant digit. format() will give both the real and imaginary
parts accurate to 1 significant digit. Since the real part has two
digits, it handles the imaginary part as 04, which is rendered as 0.
The questionable part of the design is that 11+4i would be rendered as
11+0i, i.e. two digits accuracy are given in the real part even though
you only asked for one. I think it would be better to be consistent
here. I think it makes more sense to give 11+4i (or 10+4i in your
example) than to give 10+0i for both, but I think that is a matter of
taste, rather than a bug fix.
I have also prepared a patch for the 15411 bug; I'll compare mine to
yours and commit something, but not for a week or so: I am mostly
offline until then.
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