printing of complex numbers in R-alpha
Hello
got it:
o The printing of complex numbers has changed, handling numbers
as a whole rather than in two parts. So both real and
imaginary parts are shown to the same accuracy, with the
'digits' parameter referring to the accuracy of the larger
component, and both components are shown in fixed or
scientific notation (unless one is entirely zero when it is
always shown in fixed notation).
[this from the NEWS of R-2.2.0]
I'm struggling to reconcile the final clause of this with:
> 1e100 + 1i
[1] 1e+100+1i
> 1e100 + 1e-100i
[1] 1e+100+0i
in both of these cases, the real component is shown in scientific
notation and the imaginary component isn't.
I'm finding the following example confusing too:
> 1e100 + pi*1i*10^(c(-100,0,1,40,100))
[1] 1e+100+3.1416e-100i 1e+100+ 3.1416e+00i 1e+100+ 3.1416e+01i
[4] 1e+100+ 3.1416e+40i 1e+100+3.1416e+100i
>
rksh
On 21 Sep 2006, at 14:11, Prof Brian Ripley wrote:
On Thu, 21 Sep 2006, Martin Maechler wrote:
"Robin" == Robin Hankin <r.hankin at noc.soton.ac.uk>
on Thu, 21 Sep 2006 08:05:24 +0100 writes:
Robin> Hello everyone Robin> I am finding complex numbers to be printed oddly in R- alpha.
1e100+1e100i
Robin> [1] 1e+100+1e+100i
1e100 + 1e44i
Robin> [1] 1e+100+100000000000000008821361405306422640701865984i
dput(1e100+1e44i)
Robin> 1e+100+100000000000000008821361405306422640701865984i
ouch, ouch! Robin> [same thing at home on a linux box] Robin> The first line is what I would expect, the second and third lines Robin> aren't: Robin> I would prefer "1e100+1e44i". Is this possible for R-2.4.0? It should.
I think the right answer is 1e100+0i: read what 'digits' means for complex numbers. It's been there since 2.2.0. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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-- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743