Description

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
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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

See also: TFJAC, TFJACLINE, TFJACTRI, TFJACTET, TFJACHEX.