Count/find/sum the number of statements to calculate percentage

Hi,

Using a loop to solve several quadratic equations, my script calculates tells me whether 'The equation is good' or 'The equation has no real roots'.

These statements are printed using fprintf. In the form:

The equation is good

The equation is good

The equation has no real roots

The equation is good...etc

Is there an easy way to calculate how many times 'The equation is good' is printed?

I've tried to use sum(fprintf== 'The equation has no real roots') but it doesn't seem to work.

Thanks

Answer 1

[Wayne King]

You can always include a counter variable in the loop

   k = 0; % outside the loop, set k to 0

   if (your real roots test)
   fprintf('The equation has no real roots\n');
   k = k+1;

   end

   sum(k)

[Stuart]

Thanks for that!

Simple but effective!

Answer 2

[Andrei Bobrov]

eg

ii = 0;
for ...
    ...
    if all(abs(imag(roots) < 100*eps))
        fprintf('The equation is good');
        ii = ii + 1;
    end
    ...
end