[petsc-users] TaoSetVariableBounds in petsc4py

[Jason Sarich]

Hi Justin,

The C interface allows null to be passed as one of the vectors, this looks
like an issue with the petsc4py interface specifically.

You can create the unneeded bound vector and set it to infinity or negative
infinity, and pass it to this function instead of using none (TAO will do
this anyway if you pass in NULL).

Jason


On Thu, Sep 17, 2015 at 4:00 PM, Justin Chang <jychang48 at gmail.com> wrote:

> Matt,
>
> This is the error I get if I use None:
>
> Traceback (most recent call last):
>   File "2D_plume_ADR_ex1.py", line 146, in <module>
>     tao_D.setVariableBounds(lb_vec,None)
>   File "PETSc/TAO.pyx", line 198, in petsc4py.PETSc.TAO.setVariableBounds
> (src/petsc4py.PETSc.c:189484)
> TypeError: Cannot convert NoneType to petsc4py.PETSc.Vec
>
> Thanks,
> Justin
>
> On Thu, Sep 17, 2015 at 2:59 PM, Matthew Knepley <knepley at gmail.com>
> wrote:
>
>> On Thu, Sep 17, 2015 at 3:55 PM, Justin Chang <jychang48 at gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> I am attempting to use TaoSetVariableBounds via petsc4py. Is there a way
>>> to set only lower bounds or upper bounds and not both? In PETSc I could
>>> replace one of the Vecs with NULL, but how would I do that with
>>> tao.setVariableBounds(...)?
>>>
>>> It seems right now I can only do tao.setVariableBounds(lb_vec,ub_vec),
>>> and from inspection of the python source code, it seems I have to specify
>>> both?
>>>
>>
>> Can you jsut give None?
>>
>>   Matt
>>
>>
>>> Thanks,
>>> Justin
>>>
>>
>>
>>
>> --
>> What most experimenters take for granted before they begin their
>> experiments is infinitely more interesting than any results to which their
>> experiments lead.
>> -- Norbert Wiener
>>
>
>
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