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### d_dxi: derivatives

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## NAME

d_dxi -- derivatives## SYNOPSIS

form (const space V, const space& M, "d_dx0"); form (const space V, const space& M, "d_dx1"); form (const space V, const space& M, "d_dx2");DESCRIPTION

Assembly the form associated to a derivative operator from theVfinite element space to theMone: / | d u b_i(u,q) = | ---- q dx, i = 0,1,2 | d xi / Omega In the axisymetricrzcase, the form is defined by / | d u b_0(u,q) = | --- q r dr dz | d r / Omega If the V space is aP1(resp.P2) finite element space, the M space may be aP0(resp.P1d) one.## EXAMPLE

The following piece of code build the Laplacian form associated to the P1 approximation: geo omega ("square"); space V (omega, "P1"); space M (omega, "P0"); form b (V, M, "d_dx0");## LIMITATIONS

Only edge, triangular and tetrahedal finite element meshes are yet supported. D_DXI(7)

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