[Rd] cummax / cummin for complex numbers
marc_schwartz at me.com
Mon Jul 14 17:27:06 CEST 2014
Ah! That was not clear and this early on a Monday morning, insufficient caffeine levels are common. :-)
I can confirm that this is still an issue in 3.1.1, which is a version newer than what Michael is running and the current stable release.
They appear to be still reversed in the current SVN trunk (aka R-Devel):
On Jul 14, 2014, at 10:18 AM, Duncan Temple Lang <dtemplelang at ucdavis.edu> wrote:
> 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 ...
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