whats wrong with this code? Im trying to find the first 50 primes in a sequence, and then sort it into a 5x10 array

Question

Mia 2023-5-11

0
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https://ww2.mathworks.cn/matlabcentral/answers/1961639-whats-wrong-with-this-code-im-trying-to-find-the-first-50-primes-in-a-sequence-and-then-sort-it-i

评论： Image Analyst 2023-5-19

function result = primenumbers(n)

if n <= 1

result = false;

return;

end

for i = 2:sqrt(n)

if rem(n, i) == 0

result = false;

return;

end

result = true;

end

primes = [];

n = 2;

while length(primes) < 50

if primenumbers(n)

primes = [primes n];

end

n = n + 1;

end

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Answer 1

Dyuman Joshi 2023-5-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1961639-whats-wrong-with-this-code-im-trying-to-find-the-first-50-primes-in-a-sequence-and-then-sort-it-i#answer_1233284

在 MATLAB Online 中打开

Firstly, do not use built-in functions as variables names, primes in this case.

Secondly, all the functions in a script must be at the end. Shift any functions in the script to the bottom.

Use reshape to change the vector into a 5x10 array.

p = [];
n = 2;
while length(p) < 50
    if primenumbers(n)
        p = [p n];
    end
    n = n + 1;
end
p
p = 1×50
     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
function result = primenumbers(n)
    if n <= 1
        result = false;
        return;
    end
    for i = 2:sqrt(n)
        if rem(n, i) == 0
            result = false;
            return;
        end
    end
    result = true;
end

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Mia 2023-5-11

Thanks brother

Image Analyst 2023-5-19

If this Answer solves your original question, then could you please click the "Accept this answer" link to award the answerer with "reputation points" for their efforts in helping you? They'd appreciate it. Thanks in advance. 🙂 Note: you can only accept one answer (so pick the best one) but you can click the "Vote" icon for as many Answers as you want. Voting for an answer will also award reputation points.