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
 <[email protected]>
 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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