Re: [Libmesh-users] question about the numeric vector

[Michael P. <mpo...@pu...>]

I added a plain System class, and it worked.

Michael.


On 01/25/2018 12:17 PM, Roy Stogner wrote:
>
> On Thu, 25 Jan 2018, Michael Povolotskyi wrote:
>
>> I will add another system and will not solve it.
>
> Make sure it's ExplicitSystem (no, wait, maybe just plain System?
> ExplicitSystem does still allocate an rhs, not just a solution).
>
> ImplicitSystem will try to allocate a Jacobian for you whether you
> plan to eventually assemble and solve with it or not, and that can get
> expensive.
> ---
> Roy
>
>
>> On 01/25/2018 08:25 AM, Roy Stogner wrote:
>>>
>>>  On Wed, 24 Jan 2018, Paul T. Bauman wrote:
>>>
>>>>  Sorry for slow response. I have nothing better to offer other than 3
>>>>  vectors, but maybe others will.
>>>
>>>  You can add another ExplicitSystem to the mesh, giving it a
>>>  vector-valued variable corresponding to your solution system's
>>>  scalar-valued variable.
>>>
>>>  This is more flexible (if you have multiple variables in your solution
>>>  system but only want to add a vector-valued postprocessed field for
>>>  one of them, for instance) but probably a bit harder to work with.
>>>  ---
>>>  Roy
>>>
>>>>  On Mon, Jan 22, 2018 at 12:40 PM, Michael Povolotskyi
>>>>  <mpo...@pu...>
>>>>  wrote:
>>>>
>>>>>  Dear Libmesh developers and users,
>>>>>
>>>>>  I need to compute a field on mesh based on a solution.
>>>>>
>>>>>  To do so I usually add a vector to a system and fill it with data.
>>>>>
>>>>>  This works perfectly for a scalar field.
>>>>>
>>>>>  What would you recommend to do for a vector field.
>>>>>
>>>>>  Of course, I can add 3 vectors, one for each component of the 
>>>>> field. Is
>>>>>  there a better way?
>>>>>
>>>>>  Thank you,
>>>>>
>>>>>  Michael.
>>>>>
>>>>>
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>>
>>
>>