[ncl-talk] output of dgeevx_lapack

[Andy]

Does anyone have any feedback on how to access the condition numbers 
that dgeevx_lapack should be able to calculate?

Thanks
Andy

On 02/20/2017 06:20 PM, Andy Miller wrote:
>
> The argument I am confused by is called "sense". The Fortran 
> description reads as follows:
>
> SENSE   (input) CHARACTER*1
> *          Determines which reciprocal condition numbers are computed.
> *          = 'N': None are computed;
> *          = 'E': Computed for eigenvalues only;
> *          = 'V': Computed for right eigenvectors only;
> *          = 'B': Computed for eigenvalues and right eigenvectors.
> *          If SENSE = 'E' or 'B', both left and right eigenvectors
> *          must also be computed (JOBVL = 'V' and JOBVR = 'V').
>
> The other arguments produce reasonable results and, most importantly, 
> change the output in a way I can follow. Changing the 5th or sense 
> argument doesn't seem o have any effect.
>
> On 2/20/2017 5:49 PM, Dennis Shea wrote:
>> Offline.
>> I am out most of the week. I have no access to a computer till later. 
>> Can u pls click on the 'dgeevx' link in the function documentation? 
>> This gives the Fortran documentation. What arguments are you asking 
>> about?
>>
>> Sent from my iPhone
>>
>> On Feb 20, 2017, at 1:57 PM, Andy <awmiller at mit.edu 
>> <mailto:awmiller at mit.edu>> wrote:
>>
>>> Hello,
>>> I am running NCL version 6.3.0 on a Linux (Ubuntu) machine with a 
>>> bash shell. I am trying to use the dgeevx_lapack function for the 
>>> first time. The documentation includes an option to calculate 
>>> reciprocal condition numbers. Enabling that option will not lead to 
>>> any error messages, but I also can't find the result of that 
>>> calculation. Running the command in the following three versions:
>>>
>>> evl = dgeevx_lapack(M,"N","V","V","N",False)
>>>
>>> evl = dgeevx_lapack(M,"N","V","V","E",False)
>>>
>>> evl = dgeevx_lapack(M,"N","V","V","B",False)
>>>
>>> for any given matrix M results in variables evl that contain the 
>>> same number of values and are seemingly identical otherwise, too.
>>>
>>> How can I access the reciprocal condition numbers? Is there another 
>>> ncl function I should use?
>>>
>>> Thanks for your help,
>>> Andy
>>>
>>> -- 
>>> Andy Miller
>>> MIT PAOC PhD Candidate
>>>
>>> 77 Massachusetts Ave | 54-1715
>>> Cambridge, MA 02139
>>>
>>> Phone: 617-253-3715
>>> Email:awmiller at mit.edu
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