[petsc-users] A Question about Vec

[Ryan Yan]

Hi all,
Can someone help me to understand the "Vec"?

My question is: in the following piece of code, will "a" be changed, if "b"
is changed by the subroutine "SNESComputeFunction"? I did see that both a
and b are both pointers to an object.

Vec a = b;
Vec c;

initalize c;
SNESComputeFunction(snes, c, b);

If the answer is yes, then I guess what is modified is actually "*b" in the
above code, is that right?

BTW, I am wondering is there any explicit way that one can compare two
variables in the instance above in PETSc , especially when the content of
the object is rich.

Thanks you very much,

Yan
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