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

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Stuart
Stuart 2012-4-17
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

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采纳的回答

Wayne King
Wayne King 2012-4-17
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)

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2012-4-17
eg
ii = 0;
for ...
...
if all(abs(imag(roots) < 100*eps))
fprintf('The equation is good');
ii = ii + 1;
end
...
end

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