MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn moreOpportunities for recent engineering grads.

Apply Today
Asked by Rahul Singh on 13 Apr 2012

anyone please tell me in matlab how to write a function to find prime number of any number if it is not prime number then function show its nearest prime numbers... let take example ...take number 9 we know it is not prime then the program will show its nearest prime like 7 and 11..

*No products are associated with this question.*

Answer by Andrei Bobrov on 13 Apr 2012

Accepted answer

input `x`

x = 24;

solution

X = [x x]; out = zeros(1,2); while 1 t = isprime(X); if all(t) out = X; break elseif any(t) out(t) = X(t); t1 = ~t; X(t1) = X(t1) - sum([1 -1].*t1); else X = X - [1 -1]; end end out = unique(X)

Rahul Singh on 14 Apr 2012

thanks Andrei Bobrov........i think this is useful answer for me............

## 2 Comments

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/35370#comment_73518

if this is homework, can you show, what you have done so far?

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/35370#comment_73560

What have you tried so far and which problem occurred?