[ncl-talk] output of dgeevx_lapack

[Andy]

Hi Kevin,
I attached a simple script to explain my problem. The script does not 
produce any error messages. However changing the "sense" argument 
doesn't seem to affect the result either. To me the variables evl1 and 
evl2 look identical. So my question is how can I access the reciprocal 
condition numbers that should have been calculated in evl1.

Thanks,
Andy

On 03/02/2017 12:36 PM, Kevin Hallock wrote:
> Hi Andy,
>
> Do you have an example script in which you’re trying to use 
> dgeevx_lapack(), and if so would you be willing to share it?
>
> Thanks,
> Kevin
>
>> On Feb 27, 2017, at 10:02 AM, Andy <awmiller at mit.edu 
>> <mailto:awmiller at mit.edu>> wrote:
>>
>> 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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