FEATool Multiphysics
v1.17.2
Finite Element Analysis Toolbox
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TFJAC Computes transformation Jacobian and determinant.
[ AJTMP, AJAC ] = TFJAC( I_FLAG, P, C, AJTMP, XI, AJAC ) Computes the inverse of the transformation Jacobian and corresponding determinant in point XI (in local coordinates). The input and output array AJTMP saves and reuses factors that are independent of the evaluation point XI.
Input Value/(Size) Description ----------------------------------------------------------------------------------- i_flag (scalar) Evaluation flag (0=Help array, 1=All, 2=Jac.) p (n_sdim,n_p) Array of cell vertex coordinates c (n_pcell,n_c) Index array for cells to evaluate aJTmp (n_c,:) Temporary help array xi (n_sdim(+1)) Local cell coordinates to evaluate aJac (n_c,:) Array for Jacobian inverse and determinant store_aJTmp (scalar) Flag to store aJTmp as a persistent variable Output Value/(Size) Description . ----------------------------------------------------------------------------------- aJTmp (n_c,:) Temporary help array aJac (n_c,:) Array for Jacobian inverse and determinant