<div class="gmail_quote">Hi<div><br></div><div>I am solving an elliptic problem with Neumann boundary condition with dmda routines by snes solver.</div><div>I set up the residue by DMDASetLocalFunction.</div><div>Besides the way like fix the first value to be one by myself, is there way to do it by petsc routine? like the <span style="font-family:Simsun;background-color:rgb(213,234,255);font-size:medium">KSPSetNullSpace() rountine does?</span></div>
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<div><br clear="all"><div><span class="Apple-style-span" style="color: rgb(0, 0, 0); ">-- </span></div></div></font></span></div>Hailong<br>