How to print all prime numbers between 1 and 100 using a for loop?

for f = (1:100)
    f
     isprime(f)
   j = all(f)  
end
fprintf('%j',j) 

This is what I have, I either get j as logical or if I change it to "fprintf('%f', f)" I get f = 100.

I need to print the prime numbers.

What am I doing wrong?

[Maheen]

prime number between 7 and 47

[Voss]

@Maheen: The accepted answer finds primes between 1 and 100. Try to adapt it to find primes between 7 and 47.

Answer 1

[KSSV]

num = 1:100 ;  % numbers till 100 
idx = isprime(num) ;   % get logical indices of prime numebrs 
num(idx)  % print the prime numbers 

ans = 1×25

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

[Elijah McNeil]

Ok, so that does work, but I forgot to mention that I need to print the prime numbers, How do I do that?

[KSSV]

Hey num(idx) will print the prime numbers on screen. Did you run the code?

[Elijah McNeil]

Yes I ran it, but I was trying to get it without the '[ ]' for non-prime numbers. Is there a way to do that?

[KSSV]

primenum = [num(idx)]

[Elijah McNeil]

That worked, Thank You for your help.

[Stephen23]

The square brackets here are completely superfluous:

primenum = [num(idx)]

Get rid of them, they do absolutely nothing.

[KSSV]

Yes @Stephen..

primenum = num(idx) ; 

is enough.