My function is running fine for small no but not for big no.Can anybody explain?
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function k=next_prime(n)
k=2;
while(k>2)
if(isprime(k)==1)
if(k>n)
return
else
k=k+1;
end
else
k=k+1;
end
end
1 Commento
Walter Roberson
il 25 Set 2021
k=2;
while(k>2)
You initialize k to 2, but you check k>2 which is immediately false.
Risposta accettata
DGM
il 25 Set 2021
Modificato: DGM
il 25 Set 2021
Consider:
a = next_prime(17560)
b = next_prime(5346551)
function k = next_prime(n)
k = n;
while true
if isprime(k)
break;
end
k=k+1;
end
end
3 Commenti
Walter Roberson
il 25 Set 2021
Modificato: Walter Roberson
il 25 Set 2021
What is an example of an input that it gives the wrong answer for?
Your code is slow. There is no point in testing any number that is lower than the input, n, because it does not matter if any of them are prime: all that matters is starting from n . And making sure that you carefully define what is intended to happen if the input is already a prime.
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