Producing 100 prime number in a vector

Question

Abhishek 2022-10-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1837658-producing-100-prime-number-in-a-vector

回答： David Hill 2022-10-27

Hi,

I want to generate a vector in which I could check that vector for prime numbers using isprime(vector). So far I have been able to get the get a vector, but it does not give the number which are prime. Instead it gives out a vector where all the prime numbers are replaced by one and non prime with zero.

p=(2:1:600)

y=isprime(p)

I used the following code.

Thanks in advance

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Answer 1

David Hill 2022-10-27

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1837658-producing-100-prime-number-in-a-vector#answer_1085628

在 MATLAB Online 中打开

p=(2:1:600);
p(isprime(p))
ans = 1×109
     2     3     5     7    11    13    17    19    23    29    31    37    41    43    47    53    59    61    67    71    73    79    83    89    97   101   103   107   109   113
primes(600)%better and faster
ans = 1×109
     2     3     5     7    11    13    17    19    23    29    31    37    41    43    47    53    59    61    67    71    73    79    83    89    97   101   103   107   109   113