basic MATLAB question

You shouldn't need the for loop...A quick look suggests this should work.

function p = myprimes(N) found = 0; trynumber = 2; p = zeros(1,N); while (found N) if isprime (trynumber); p(i) = trynumber; found = found + 1; end trynumber = trynumber + 1; end

should be p(found) not p(i)

function p = myprimes(N) found = 0; trynumber = 2; p = zeros(1,N); while (found N) if isprime (trynumber); p(found) = trynumber; found = found + 1; end trynumber = trynumber + 1; end

phdconsultant,

Thanks for the help. I'm still getting an error with the suggestions, but I tried something else and I got closer, except the output vector has these spacer zeros, but the correct number of prime numbers in the correct order. At this point I just need to get rid of those zeros in the output vector. This is what I have so far:

function p = myprimes(N) found = 0; trynumber = 2; p = zeros(1,N); while (found N) if isprime (trynumber); % for i=1:N; p(trynumber) = trynumber ; found = found + 1; end trynumber = trynumber + 1; end

myprimes(11) ans =

Columns 1 through 30:

0 2 3 0 5 0 7 0 0 0 11 0 13 0 0 0 17 0 19 0 0 0 23 0 0 0 0 0 29 0

Column 31:

31

inside your while loop, change

p(trynumber) = trynumber ; found = found + 1;

to

found = found + 1; p(found) = trynumber;