On 02/16/2018 07:34 PM, Moraad Biagooi wrote:

As you suggested, I tried a 2D mesh. The plots shows that the sign difference
happens at the edge of two neighbor symmetric cells answers. Two gradient
functions may calculate on different cells, so it looks like the signs are different.

So it looks to me that there was no problem to begin with.

Great, good to know!
Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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