how to make a function that take an integer as input and return ture if this prime otherwise false
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Hi everyone; I am going to attempt that question: Write a function myprime that takes n, a positive integer, as an input and returns true if n is prime or returns false otherwise. Do not use the isprime or primes or factor built-‐in functions. Hint: you can use the rem or fix functions. I am using that code
function prime=myprime(n)
a=abs(n);
i=1;
while i<a
if rem(a,i)~=0
prime='TURE';
else
prime='FALSE';
end
i=i+1;
end
end
and getting error
Feedback: Your function made an error for argument(s) 2
Your solution is _not_ correct.
Guide me where i need corrections in my code. Thanks in advance for assistance..
댓글 수: 3
Ryan Livingston
2015년 5월 28일
I removed the product tag for "MATLAB Coder" below since this example is not using the product MATLAB Coder. Please only use that product tag when this product is involved. Thank you.
채택된 답변
Andrei Bobrov
2015년 5월 28일
function p = myprime(n)
p = n-nnz(rem(n,1:n)) == 2;
댓글 수: 2
Andrei Bobrov
2015년 5월 29일
a = rem(n,1:n) % determining the remainder of division n on a series of numbers 1: n
b = nnz (a); % the number of divisions with remainder
out = n-2 == b; % condition for prime number
추가 답변 (2개)
B.k Sumedha
2015년 5월 28일
function result = isprime2(number)
number=5;
result=true;
%%check if number is a nonnegative integer
if floor(number)~=number || number<0
result=false;
return
end
%%check if number can be divided by another integer
for k=2:(number/2)
if rem(number,k)==0
result=false;
return
end
end
Returns 1 if the number isprime and returns 0 if the number is not prime.
charu sharma
2015년 8월 20일
For number n being prime, if it is divisible by any of the numbers from 2 to n/2 then it is not prime so you just need to check the divisibility till n/2. MATLAB uses 0 or 1 in place of false and true. You can refer this too for less time complexity: http://farzicoders.blogspot.in/2015/08/write-function-myprime-that-takes-n.html
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