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Note that PETSc is designed to hide the details of the
implementations from you (It's in C, but uses the techniques of
Object-Oriented programming that you might be more familiar with in
C++), so normal use would never require the user to know anything
about the way PETSc objects represent data. In cases cases where
access to lower-level representations of the data is useful, there
is an interface provided to do this, as with Vec[Get/Set]Array (see
the tutorials included in the src/ tree for many examples - if you
look at the bottom of the link Anton provided, you'll see a handy
list of links to ones that use that particular function). <br>
<br>
The definitions of the functions in VecOps will depend on the
implementation of Vec being used, and this is in general only known
at runtime (which is a great advantage, as you can use command line
arguments to change which implementation is used without recompiling
anything). The various function definitions should be found in
src/vec/vec/impls and subdirectories.<br>
<br>
So, while it is possible to access the data stored in an object and
print it and so on, you'd have to include a private header and it'd
be a bit ugly. Perhaps a better way to poke around is to use a
debugger like gdb or lldb (or something else built into your IDE if
you're using one) - that should be quicker, and not require to you
to spend time recompiling things.<br>
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<div class="moz-cite-prefix">On 9/28/14 1:57 PM, Parvathi M.K wrote:<br>
</div>
<blockquote
cite="mid:CA+Z2ge-n2ks51pyvN3sa37QA9UGkOenBdN6C5SRs9QTgjoSroA@mail.gmail.com"
type="cite">
<div dir="ltr">I want to access the data stored in the vec object
directly without using any functions. Is this possible?
<div><br>
</div>
<div>I tried using something like p->hdr._ in a printf
statement (where p is a vector). I wish to know which element
of the _p_Vec structure stores the data. </div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sun, Sep 28, 2014 at 4:45 PM,
Parvathi M.K <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:phoenixauriga@gmail.com" target="_blank">phoenixauriga@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hey,
<div> </div>
<div>I am fairly new to PetSc. I was just curious as to
how you can directly access the data stored in a Petsc
object, say a vector without using VecGetValues().</div>
<div><br>
</div>
<div>I've gone through the header files, petscimpl.h and
vecimpl.h which contain the definitions of the
PetscObject and Vec structures. I cannot figure out
which member of the struct holds the Vector data entered
using VecSet(). Also, I could not find the definitions
of the functions in VecOps. Could someone tell me where
I can find these function definitions? </div>
<div><br>
</div>
<div>Thank you :)</div>
<span class="HOEnZb"><font color="#888888">
<div><br>
</div>
<div>Parvathi</div>
</font></span></div>
</blockquote>
</div>
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</blockquote>
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