How do i modify the code when a=0,a=0.1,...,a=0.9,a=1

I want to calculate the Ps when a=0.1,a=0.2,....,a=0.9,a=1.0 , so i think i should have 11 different Ps number,however,the window always show me 11 same number,it seems that it just calculate 11 times when the "a" is the same number.

How do i modify my code?

a=0:0.1:1
B=[1;2;3;4;5;6]
C=[7;8;9;10;11;12]
gN=1;
for i=1:1:length(a)
    f_A=( a(i)*B+(1-a(i))*C)/norm( (a(i)*B+(1-a(i))*C)    );
    PsB=abs((gN)/(f_A'*f_A));
    PsC=abs((gN)/(f_A'*f_A));
    if PsB > PsC
        Ps(i)=PsB
    else
        Ps(i)=PsC
    end
end

The window show me

Ps =

  Columns 1 through 5

    1.0000    1.0000    1.0000    1.0000    1.0000

  Columns 6 through 10

    1.0000    1.0000    1.0000    1.0000    1.0000

  Column 11

    1.0000

[Ankit]

it should be the same number

PsB = num/den , your num is 1 and product of f_A'*f_A is also 1.

What i dont understand size of your variable a is 11, B & C is 6.