MATLAB: Erorr in for loop

for loop

could you please help me to correct these small calculations
 w=0:0.02:5;
 for i=1:length(w)
 a(i)=w.^4-12.*(w.^2);
 b(i)=w.^8-144.*(w.^4);
 c(i)=9.*(w.^6)+256.*(w.^2);
 Real(i)= a(i)/(b(i)+c(i));
 end
thank you

Best Answer

.^ is for element wise operation. Use this:
 w=0:0.02:5;
 for i=1:length(w)
     a(i)=w(i)^4-12*(w(i)^2);
     b(i)=w(i)^8-144*(w(i)^4);
     c(i)=9*(w(i)^6)+256*(w(i)^2);
     Real(i)= a(i)/(b(i)+c(i));
 end
Or better:
w=0:0.02:5;
a = w.^4-12.*(w.^2);
b = w.^8-144.*(w.^4);
c = 9.*(w.^6)+256.*(w.^2);
Real= a./(b+c);
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