[Rd] cummax / cummin for complex numbers
michael.haupt at oracle.com
Mon Jul 14 18:17:33 CEST 2014
.. spot on. :-)
Apologies for not having been more "pointy" about the problem - this just confirms it *is* kind of subtle. :-)
Am 14.07.2014 um 17:18 schrieb Duncan Temple Lang <dtemplelang at ucdavis.edu>:
> I believe Michael's point is that the error messages
> are incorrect - referring to cunmax when cunmin was called
> and vice verse.
> On 7/14/14, 8:14 AM, Ben Bolker wrote:
>> Michael Haupt <michael.haupt <at> oracle.com> writes:
>>> Dear all,
>>> in R 3.1.0, this is happening:
>>> Error in cummin(c(1 + (0+1i), 2 - (0+3i), 4 + (0+5i))) :
>>> 'cummax' not defined for complex numbers
>>> Error in cummax(c(1 + (0+1i), 2 - (0+3i), 4 + (0+5i))) :
>>> 'cummin' not defined for complex numbers
>>> It may be fixed in R-devel, but I thought I'd mention it to make sure ...
>> Well, it is documented in the development version:
>> x: a numeric or complex (not ‘cummin’ or ‘cummax’) object, or an
>> object that can be coerced to one of these.
>> I imagine the problem is in coming up with a good, consistent definition
>> of the min/max for complex numbers: would you prefer min/max modulus,
>> phase, real part, imaginary part ... ? max()/min() aren't even defined
>> for complex numbers in R ...
Dr. Michael Haupt
Principal Member of Technical Staff
Phone: +49 331 200 7277, Fax: +49 331 200 7561
Oracle Deutschland B.V. & Co. KG, Schiffbauergasse 14, 14467 Potsdam, Germany
More information about the R-devel