[Rd] cummax / cummin for complex numbers

[Duncan Temple Lang]

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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