[R] < 0 x 0 matrix >

[Duncan Murdoch]

Duncan Murdoch wrote:
> baptiste auguie wrote:
>   
>> it's documented as "unexpected"
>>
>> ?diag
>> Note
>>
>> Using diag(x) can have unexpected effects if x is a vector that could be of
>> length one. Use diag(x, nrow = length(x)) for consistent behaviour.
>>
>>
>> And the result follows from this part,
>>
>>     else if (length(x) == 1L && nargs() == 1L) {
>>         n <- as.integer(x)
>>         x <- 1
>>     }
>>   
>>     
>
> Looks like the man page is wrong:  it says diag(0.9) should produce a 
> 1x1 matrix, but as the code shows, it produces a 0x0 one.
> I'll fix it.
>   

Oops, this has already been fixed.  I was looking at an old version of R 
on this laptop.

Duncan Murdoch
> Duncan Murdoch
>   
>> baptiste
>>
>> 2009/9/4 Markku Karhunen <markku.karhunen at helsinki.fi>
>>
>>   
>>     
>>> Hi,
>>>
>>> Does anybody know, what is going on here?
>>>
>>>  diag(sqrt(1))
>>>     
>>>     [,1]
>>> [1,]    1
>>>
>>>     
>>>       
>>>> diag(sqrt(0.3333))
>>>>
>>>>       
>>>>         
>>> <0 x 0 matrix>
>>>
>>>     
>>>       
>>>> sqrt(1)
>>>>
>>>>       
>>>>         
>>> [1] 1
>>>
>>>     
>>>       
>>>> sqrt(0.3333)
>>>>
>>>>       
>>>>         
>>> [1] 0.5773214
>>>
>>> BR, Markku Karhunen
>>> researcher
>>> University of Helsinki
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>>     
>>>       
>>
>>   
>> ------------------------------------------------------------------------
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>     
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>