Any suggestions? New Matlab user. I know I removed all evens and left with odds but when I try to manipulate to take the primes out from the odds it is not working. Thank you. Just need some hints.

clear;

clc;

tic;

N=15 %largest number in list

R=linspace (1,N,N) %starting list - all numbers up to n - Matlab

%linspace calculates the space evenly between elements 1=starting value,

%N=largest value, N=total

nextprime=2 %starting with 2

if (nextprime*nextprime) <N %quit once through all numbers

end

for k=2:N %starts at 2 to start looking for prime

if nextprime*k <=N %don't exceed length of vector

R(nextprime*k) = 0 % 0 if even

end

end

% end %this is taking out all the even numbers

%trying to get prime only numbers --THIS IS WHERE MY PROBLEM IS

for n=2:N %starts at 2 to start prime ???

if R (nextprime+n) <=0 %go up list until first

if nextprime +n <=N %looking for non-zero

sqrt(nextprime) %if non-zero -- looking for prime

nextprime = R(nextprime+n) %update nextp

end

end

end

primeven=[]; %start with empty vector

for n=2:length(R); %list primes only - omit "1"

if (R(n)~=0);

primeven=[primeven,R(n)] %add to existing vector of

%primes

end

end