Artifact 5c0ff9f283bd85dfba73073fbeb9da39ad3da8692fbc3ae64d77f8076f4546c1:

• Executable file r37/packages/alg/fac.red — part of check-in [f2fda60abd] at 2011-09-02 18:13:33 on branch master — Some historical releases purely for archival purposes

  git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/trunk/historical@1375 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 1154) [annotate] [blame] [check-ins using] [more...]

• Executable file r38/packages/alg/fac.red — part of check-in [f2fda60abd] at 2011-09-02 18:13:33 on branch master — Some historical releases purely for archival purposes

  git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/trunk/historical@1375 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 1154) [annotate] [blame] [check-ins using]

module fac;  % Support "factor" as an operator.

% Author: Anthony C. Hearn.

global '(!*micro!-version);

symbolic procedure factor u;
   if !*micro!-version then factor0 u else factor1(u,t,'factors!*);

symbolic procedure factor0 u;
   begin scalar oldexp,v,w;
      if cdr u or kernp (v := simp!* car u)
        then <<lprim "Please use FAC instead"; 
               return factor1(u,t,'factors!*)>>;
      oldexp := !*exp;
      !*exp := t;
      if null oldexp then v := resimp v;
      w := !*fcfm2f fctrf numr v ./ !*fcfm2f fctrf denr v;
      if null oldexp then !*exp := oldexp;
%      if w = u or w = v then return u
%       else if null oldexp then return mk!*sq w
%       else return list('!*sq,w,nil)
      return mk!*sq w
    end;

flag('(factor),'intfn);

symbolic procedure !*fcfm2f u;
   % converts factored form u to standard form.
   multf(car u,!*fcfm2f1 cdr u);

symbolic procedure !*fcfm2f1 u;
   if null u then 1 else multpf(mksp(caar u,cdar u),!*fcfm2f1 cdr u);

symbolic procedure expandd u; reval u where !*exp = t;

flag('(expandd),'opfn);

flag('(expandd),'noval);

endmodule;

end;