清空筛选条件
清空筛选条件

I need a function that returns the smallest prime number p smaller than 100,000 such that (p + n) is also prime, where n is a scalar integer and is the sole input argument to the function

1 次查看（过去 30 天）
Octavzz
Octavzz 2015-8-26
编辑： Stephen23 2015-8-27
Write a function called prime_pairs that returns the smallest prime number p smaller than 100,000 such that (p + n) is also prime, where n is a scalar integer and is the sole input argument to the function. If no such number exists, then the function returns -1. You may use the built-in functions, primes and isprime.
  3 个评论
显示 1更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Stephen23
Stephen23 2015-8-27
编辑：Stephen23 2015-8-27
function p = prime_pairs(n)
V = primes(1e5);
V = V(isprime(n+V));
if isempty(V)
p = -1;
else
p = V(1);
end
end

更多回答（1 个）

charu sharma
charu sharma 2015-8-27
For simple code refer this and ask if you have any query: http://farzicoders.blogspot.in/2015/08/write-function-called-primepairs-that.html
  1 个评论
Stephen23
Stephen23 2015-8-27
"simple code" with:
  • poorly named variables: for i=1:l
  • superfluous intermediate variables: flag
  • superfluous loops when code vectorization would be neater.
  • superfluous return statements.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by