what's the difference between PetscViewerASCIIOpen() and PetscViewerBinaryOpen()?

[Yujie]

thanks a lot, everyone :).

On 2/12/08, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>
>    It is important to remember what the PETSc users manual
> says
>
> "PETSc graphics library is not intended to compete with
> high-quality graphics packages.  Instead, it is intended to be
> easy to use interactively with PETSc programs. We urge users
> to generate their publication-quality graphics using a
> professional graphics package."
>
>    We are not graphics experts, nor do we want to be, or could be.
>
>     Barry
>
>
>
>
> On Feb 12, 2008, at 2:23 PM, Satish Balay wrote:
>
> > On Tue, 12 Feb 2008, Yujie wrote:
> >
> >> On 1/23/08, Matthew Knepley <knepley at gmail.com> wrote:
> >
> >>>> In addition, do you have any better methods to save the sparsity
> >>>> structure picture of the matrix? Now, I use "-mat_view_draw" to
> >>>> do this. However, the speed is very slow and the picture is
> >>>> small. I want to get a big picture and directly save it to the
> >>>> disk?  could you give me some advice? thanks a lot.
> >
> >>> We do not have a better way to make the sparsity picture. I assume
> >>> you could write something that decides how many pixels to use,
> >>> calculates an average occupancy per pixel, and writes a BMP or
> >>> something.
> >
> > Couple of notes on this.
> >
> > - -mat_view_draw can be slow for parallel runs [because all the data
> >  is moved to proc-0, from where its displayed]. If you wish to speed
> >  up, you can either:
> >  * run it sequentially [depending upon your code, the matrix generated
> >  could be different - so its not suitable]
> >  * do a binary dump [with MatView() on a binary viewer] - and
> >  then reload this matrix with a sequential code and then do mat_view
> >  [check mat/examples/tests/ex33.c,ex43.c]
> >
> > - you can use the option '-draw_pause -1' to make the window not
> >  disappear. Now you can zoom-in & zoom-out [with mouse-left or
> >  mouse-right click]
> >
> > - Take the snapshot of this window with xv or gnome-screenshot or
> > other screen-dump tool [ like 'xwd | xpr -device ps > dump.ps']
> >
> > - Alternatively you can dump the matrix is matlab format - and use
> > Matlab visualization tools.
> >
> > Satish
> >
> >
>
>
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