Message-ID: <53C3F4B4.6040405@ucdavis.edu>
Date: 2014-07-14T15:18:12Z
From: Duncan Temple Lang
Subject: cummax / cummin for complex numbers
In-Reply-To: <loom.20140714T170807-611@post.gmane.org>
I believe Michael's point is that the error messages
are incorrect - referring to cunmax when cunmin was called
and vice verse.
D.
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:
>>
>>> cummin(c(1+1i,2-3i,4+5i))
>> Error in cummin(c(1 + (0+1i), 2 - (0+3i), 4 + (0+5i))) :
>> 'cummax' not defined for complex numbers
>>> cummax(c(1+1i,2-3i,4+5i))
>> 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 ...
>>
>> Best,
>>
>> Michael
>
> 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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