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functionJ = dblsimp(a,b,c,d,m,n,f)

format long

syms xy

f1=sym(f);

f2=inline(char(f1));

J1=0;

J2=0;

J3=0;

h=(ba)!n;

"=(dc)!m;

fori=0#n

x=a$i%h;

&1=f2(x,c)$f2(x,d);

&2=0;

&3=0;

for' = 1#m1

y=c$'%";

=f2(x,y);

if(mod(',2)==0)

&2=&2$;

else

&3=&3$;

end

end

= (&1$2%&2$*%&3)%"!3;

ifi == 0 + i == n

J1 = J1$;

elseifmod(i,2) == 0

J2 = J2$;

else

J3 = J3$;

end

end

J = h%(J1$2%J2$*%J3)!3;

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