You could do it a number of different ways.
Here's two approaches
a = setdiff([1:25],primes(25))
OR
a = find(~isprime([1:25]))
题
I know I can find prime numbers less than or equal to 25 using the primes
function:
p = primes(25)
p=2 3 5 7 11 13 17 19 23
But how can I find numbers that aren't prime?
解决方案
You could do it a number of different ways.
Here's two approaches
a = setdiff([1:25],primes(25))
OR
a = find(~isprime([1:25]))