On 05/05/2018 09:11 AM, Zhao Yidong wrote:

The Point I send into the function locates in the reference space ( [-1, 1]x[-1, 1] ),

By the way, in deal.II the reference cell is [0,1]x[0,1]. So even bilinear shape functions will be negative if you evaluate them at (-1,-1), for example.

Best
 W.

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

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