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

[Roy S. <roy...@ic...>]

On Thu, 25 Jan 2018, Michael Povolotskyi wrote:

> I added a plain System class, and it worked.

Thanks!  That was fast!  (possibly causality-violatingly so?  I could
swear I saw this message header in my inbox *before* I hit send on my
own previous message...)
---
Roy

> 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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>>> 
>>> 
>
>
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