Gridfunc

{  GRIDFUNC.PDE  }

{

  This problem demonstrates the use of parametrized definitions

  (or "functions") in gridding coordinates.

}

title 'Parameterized Definition test'

Variables

    u

definitions

    xx(n) = cos(n*pi/2)                { Functional definition of coordinates }

    yy(n) = sin(n*pi/2)

equations

    div(grad(u)) + 4 = 0

boundaries

    region 1

       start(xx(0),yy(0))

       value(u)=0

       line to (xx(1),yy(1))        { definition evaluates corners of a diamond }

            to (xx(2),yy(2))

            to (xx(3),yy(3))

       to close

monitors

    contour(u)

plots

    surface(u)

    contour(u)

end