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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hi,
<div><br>
</div>
<div>I am not sure that I understand the MatStructure flag in the call of KSPSetOperators</div>
<div>correctly.</div>
<div><br>
</div>
<div>If I use KSPSetOperators(ksp, A, P, DIFFERENT_NONZERO_PATTERN) and then</div>
<div>solve two linear systems with the same matrix operators but different rhs is</div>
<div>the preconditioner reassembled in every solve. I.e., if I call</div>
<div>KSPSolve(ksp,b1,x1);</div>
<div>KSPSolve(ksp,b2,x2);</div>
<div><br>
</div>
<div>And if I use KSPSetOperators(ksp, A, P, SAME_PRECONDITIONER) the preconditioner is </div>
<div>only setup one time and reused later.</div>
<div><br>
</div>
<div>Or is the flag only important if I change the matrix operators in between.</div>
<div><br>
</div>
<div>Thank you,</div>
<div>Verena</div>
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