about MatSetValue() and VecSetValue()

Barry Smith bsmith at mcs.anl.gov
Fri Dec 19 17:32:48 CST 2008

    If INSERT_VALUE is being used then ONE of the values you put in  
ends up being the value; which one is
not under your control. If ADD_VALUES is used then the sum of all the  
values is used.

On Dec 19, 2008, at 5:28 PM, Yujie wrote:

> Hi, PETSc developer
> I am wondering if several cpus simultaneously insert the values in  
> the same position using MatSetValue() or VecSetValue(), how do the  
> functions deal with it? thanks a lot.
> Regards,
> Yujie

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