[R-SIG-Mac] NaN and linear algebra

[stefano iacus]

After some tests it appears to be vecLib specific.
If have I time, I'll try to see what's the results building with a 
different BLAS.
stefano

On 18/mar/05, at 13:30, Bill Northcott wrote:

> On 17/03/2005, at 10:00 PM, r-sig-mac-request at stat.math.ethz.ch wrote:
>> I don't know whether this is a bug, or a problem with the way I built 
>> R
>> 2.0.1 (under Mac OS 10.3 on a G5), or something else.  Can anyone else
>> confirm (or otherwise) that this happens in their R 2.0.1 on Mac OS X?
>>
>>>  d<-matrix(NaN,3,3)
>>>  d
>>      [,1] [,2] [,3]
>> [1,]  NaN  NaN  NaN
>> [2,]  NaN  NaN  NaN
>> [3,]  NaN  NaN  NaN
>>>  solve(d)
>> Error in solve.default(d) : Lapack routine dgesv: system is exactly
>> singular
>>>  chol(d)
>> Error in chol(d) : the leading minor of order 1 is not positive 
>> definite
>>>  det(d)
>> [1] 0
>>
> These are features/bugs of Apple's LAPACK library.  You would do 
> better to ask Apple support or float the question on the scitech list. 
>  They have nothing to do with R code.
>
> Bill Northcott
>
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