[petsc-users] Multiple output using one viewer

[Jed Brown]

It lets you read a time series of one field without needing to read all
fields.

Note that we could implement a "next object" seek functionality that would
partly alleviate this issue, but the reader code would still need to know
how many fields were interlaced.
On Jan 6, 2012 8:58 PM, "Barry Smith" <bsmith at mcs.anl.gov> wrote:

>
> On Jan 6, 2012, at 6:51 AM, Alexander Grayver wrote:
>
> > On 06.01.2012 13:45, Jed Brown wrote:
> >> On Fri, Jan 6, 2012 at 03:09, Alexander Grayver <
> agrayver at gfz-potsdam.de> wrote:
> >> This is not always convinient to store everything in one file, but in
> some cases I do want to use it. I haven't found any examples on that. Do I
> have to use FILE_MODE_APPEND and then write? What happens if file doesn't
> exist?
> >>
> >> You just create a viewer and then call MatView(), VecView(), etc,
> repeatedly for each object you want to put in the file (e.g. once per time
> step). No need for FILE_MODE_APPEND and unless you want to append to an
> existing file.
> >
> > Ok, that was my meaning to use PetscViewerFileSetName from the beginning
> since if you have let's say ten different objects (Mat and Vec) and you
> need to output them at each iteration (time step or frequency for
> multi-freqs modeling) you need ten viewer objects
>
>  I don't understand why you need ten viewer objects. Why not just dump all
> the objects into the one file (creating one Viewer object and never
> changing its name) one after each other and then in MATLAB read then back
> in one after the other.
>
>   Barry
>
> > which is not cool I guess, that is why I started to use one viewer and
> change just a name of the file.
> > And to be honest I don't see any reason why having ten viewers is better
> than calling PetscViewerFileSetName ten times.
> >
> > Regards,
> > Alexander
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120108/e421bf1f/attachment.htm>