Thanks Denis,

I will try to assemble and solve the system using complex-valued algebra.

Best,
Daniel

On Sunday, April 29, 2018 at 6:36:03 AM UTC+2, Denis Davydov wrote:
>
> Hi Daniel,
>
> Thanks for willing to contribute the tutorial.
>
> As far as as recall there just a few things left related to complex 
> numbers. 
> The biggest one is complex-valued Dirichlet constraints in 
> ConstraintMatrix object
> https://github.com/dealii/dealii/issues/1760 
> That's not possible yet. Otherwise all the solvers and linear algebra is 
> ready. So you can certainly assemble system and solve it.
>
> Denis.
>
> On Saturday, April 28, 2018 at 11:49:40 AM UTC+2, Daniel Garcia wrote:
>>
>> Hi,
>>
>> I'm a researcher at the CNRS (Paris). My nickname in GitHub is dangars (I 
>> contributed with a couple of pull requests)
>>
>> I work in optomechanics/phononics. I've been using deal.ii for 6 months 
>> and it works great! I developed a model of the elastic wave equation in 2D 
>> that uses PMLs.
>>
>> I'm preparing a contribution of a new step tutorial of the elastic wave 
>> equation with PMLs in 3D to GitHub/dealii. This will be useful for the 
>> phononics and optomechanics communities.
>>
>> The separation real/imag works very well with PMLs.
>>
>> The elastic/PML matrix with real/imag separation is big. If I use complex 
>> numbers the matrix will be compact and will fit in one line (much better 
>> for a step tutorial)
>>
>> What is the status of complex valued calculations? Is it ready to solve a 
>> differential equations? Is there a performance penalty with complex numbers 
>> vs separate real/imag parts?
>>
>> According to this, it seems to be almost ready:
>> https://github.com/dealii/dealii/projects/1
>>
>> Thanks,
>> Daniel Garcia
>>
>

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