nested for loop

I was wondering if there was a way to write nested loops so they are more efficient. For example:

for a = 1:1:100  
    for b = .5:.1:3
        x = bestfitfun(a,b);
    end
end

the bestfitfun is a function that runs if statements and really isn't a bottleneck. Any suggestions would be greatly appreciated.

Thank you!

[per isakson]

in the signature of bestfit are a and b assumed to be scalars?

Answer 1

[Pavel Gorodetsky]

if nesting is an issue, you can use one loop only:

 a = 1:1:1000;
 b = .5:.1:3;
 N = length(a)*length(b);

 [A,B] = meshgrid(a,b);
 for ii = 1:N
     x = bestfitfun(A(ii),B(ii));
 end

of course, as per isakson implies, if your bestfitfun could take vectors as an input, and work in some vectorized form, you could loose the two loops altogether:

   a = 1:1:1000;
   b = .5:.1:3;
   x = bestfitfun(a,b);