Question about several macros for derivatives
 

Hi, all What are the differences of the several kinds of macros for derivatives(Gradient (G) Vector Macros（_G）,Reconstruction Gradient (RG) Vector Macros（_RG）,and Derivative Macros（_DUDX）)? I have found explains about the differences between former two in the manual,but I don't understand very well. In addition, are there any macros for second derivatives? Could anyone help me? Thanks a lot!

Re: Question about several macros for derivatives
 

Forgot to say I was talking about udf ^_^