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v1.7.1 Finite Element Analysis Toolbox |
TFJACQUAD Computes transformation Jacobian and determinant for quadrilaterals.
[ AJTMP, AJAC ] = TFJACQUAD( I_FLAG, P, C, AJTMP, XI, AJAC ) Computes the inverse of the linear transformation Jacobian and corresponding determinant in point XI on quadrilateral cells. The optional input and output array AJTMP saves and reuses factors that are independent of the evaluation point.
Input Value/(Size) Description ----------------------------------------------------------------------------------- i_flag (scalar) Evaluation flag (0=Help array, 1=All, 2=Jac.) p (2,n_p) Cell vertex coordinates c (4,n_c) Cell connectivities aJTmp (n_c,4) Temporary help array xi (2) Local cell coordinates to evaluate in aJac (n_c,5) Array for Jacobian inverse and determinant store_aJTmp (scalar) Flag to store aJTmp as a persistent variable . Output Value/(Size) Description ----------------------------------------------------------------------------------- aJTmp (n_c,4) Temporary help array aJac (n_c,5) Array for Jacobian inverse and determinant