How do I create a list where it shows the values from the list 1:N so that in the list it says which numbers are prime?

Question answered

Answer 1

[Image Analyst]

Try this:

N = 55;
primeNumbers = primes(N)
fprintf('list: ');
for k = 1 : N
	fprintf('%d', k);
	if ismember(k, primeNumbers)
		fprintf(' (prime), ');
	else
		fprintf(', ');
	end
end

You get in the command window:

list: 1, 2 (prime), 3 (prime), 4, 5 (prime), 6, 7 (prime), 8, 9, 10, 11 (prime), 12, 13 (prime), 14, 15, 16, 17 (prime), 18, 19 (prime), 20, 21, 22, 23 (prime), 24, 25, 26, 27, 28, 29 (prime), 30, 31 (prime), 32, 33, 34, 35, 36, 37 (prime), 38, 39, 40, 41 (prime), 42, 43 (prime), 44, 45, 46, 47 (prime), 48, 49, 50, 51, 52, 53 (prime), 54, 55,

How's that? If you need to not print the final trailing comma, you can print a backspace.

[Catalytic Kys]

I would like to have a dot instead of the last comma, not sure how to do this though!

But thanks alot!!

[Image Analyst]

Try this:

N = 55;
primeNumbers = primes(N)
fprintf('list: ');
for k = 1 : N
	fprintf('%d', k);
	if ismember(k, primeNumbers)
		fprintf(' (prime)');
	end
	if k < N
		fprintf(', ');
	else
		fprintf('.\n');
	end
end