| #### D.15.5.1 visualize Procedure from library `finitediff.lib` (see finitediff_lib). Usage: visualize(f); f of type poly. Return: type string; translates the polynomial form of a finite difference scheme into an indexed one as often seen in literature Example:
    LIB "finitediff.lib";
    list D="Ux","Ut","U";
    list P="a";
    list V="t","x";
    setinitials(V,D,P);
    scheme(u(Ut)+a*u(Ux),trapezoid(Ux,U,x),backward(Ut,U,t));
    ==> (dx)*x+(dx)
    visualize(_);
    ==> (dx)*U(0,1)+(dx)*U(0,0)

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