How to find the efficiency of a function?

Hello, I have the following function:

function [ans] = sumdigits(N)
a = num2str(N);
sum_odd = 0;
sum_even=0;
ans=false;
for i = 1:2:size(a, 2)
sum_odd = sum_odd + str2double(a(i));
end
for j=2:2:size(a, 2)
sum_even = sum_even + str2double(a(j));
end
if sum_even>sum_odd
    ans=true;
end
disp(ans);
  end
end

I need to find the efficiency of this function and I would like to know how to find an efficiency of a function in general.

[Walter Roberson]

To improve the efficiency, change the str2double(a(i)) call to be (a(i)-'0') and str2double(a(j)) is (a(j)-'0')

Answer 1

[the cyclist]

I'm not what you mean by "efficiency". Do you mean the time the program (or specific lines) take to execute? If so, then take a look at this documentation page about measuring code performance.