[petsc-users] DMCreateXXXVector vs VecDuplicate

[Matthew Knepley]

On Mon, Sep 24, 2018 at 8:57 AM Phil Tooley <phil.tooley at sheffield.ac.uk>
wrote:

> Hi all,
>
> Can I get come clarification regarding  DMCreateXXXVector


Vectors created from a DM have additional information, such as the DM itself
and special View routines.


> vs
> VecDuplicate.


VecDuplicate will retain this special information if present


> The manual says that I can obtain additional vectors with
> the latter, does this mean that I *must* only call DMCreateXXXVector
> once each for global and local?
>

No, you can call it as much as you want.

  Thanks,

    Matt


> I ask because I want multiple instances of an image class all with the
> same distributed layout. It makes life much tidier if I can just pass
> the DMDA rather than also having to pass vectors to be copied.
>
> Cheers
>
>
> Phil
>
> --
> Phil Tooley
> Research Software Engineering
> University of Sheffield
>
>

-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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