for loops and odd numbers

I am trying to write a script that will find the product of all odd numbers that count up to a user input value. How can I write the code to identify the odd digits? If the user entered 8 I need to be able to single out the values of 1 3 5 7 to the multiply together.

Answer 1

[KSSV]

n = 8 ;
x = 1:n ;
idx = mod(x,2) 

idx = 1×8

1 0 1 0 1 0 1 0

odd_nus = x(logical(idx))

odd_nus = 1×4

1 3 5 7

[Chetan Bhavsar]

and finally do product

n = 8 ;
x = 1:n ;
idx = mod(x,2) ;
odd_nus = x(logical(idx))

odd_nus = 1×4

1 3 5 7

Product_Value = prod(odd_nus)

Product_Value = 105

[Emma Rash]

This helped a lot thank you so much! Do you happen to know why I cant put it into a for loop? It works perfectly until I add the for statement

[KSSV]

n = 8 ;
p = 1 ;  % product
for x = 1:n ;
    if mod(x,2) 
        p = p*x ; 
    end
end
p

p = 105

[Emma Rash]

Thank you! I was missing the p = p*x