MATLAB: Containg the especific number in the vector

Hi MATLAB Community,

I would to ask a help please,

my purpose in the follow code is counting, how many number greater 1 or equal (x>=1), and put in a variable the number of values greater 1.

The code are as follows:

Which is my mistake in the code?

Error message :

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error.

To construct matrices, use brackets instead of parentheses.

Thank you very much for attention

Guilherme Lopes

b = linspace(0,5,20);
n=0;
m=0;
for b = 1:n
    if b(1,:n)>=0
        n = n+1;
    else
        m=m+1;
    end
end