| #### D.15.5.14 errormap Procedure from library `finitediff.lib` (see finitediff_lib). Usage: errormap(f); f of type poly Return: type poly; performs the fouriertransformation of a single polynomial 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),central1st(Ux,U,x),backward(Ut,U,t));
    ==> (2*dx)*x
    errormap(_);
    ==> (2*dx)*i*sx+(2*dx)*cx

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