How to half the value of a constant inside an iteration?

I have an iteration loop. Inside the loop, I have a constant gamma. I want its starting value to be 10e-8. I want to half its value on every iteration (10e-4 on second iteration). How to do it?

maxiter = 100;
while iter< maxiter
    gamma = 1Oe-8
    f = gamma * p;
end

[madhan ravi]

What's p and what's the desired output ?

[OCDER]

" half its value on every iteration (10e-4 on second iteration) "

This is a confusing statement. Do you want to half it's value?

(10e-8) / 2 = 5e-9

OR

Do you want to increase the power value by half the value?

10e-8 , 10e-4, 10e-2, 10e-1, 10e-0.5 ?

[Ahmad Hasnain]

p is a number. It is a result of multiplication of two vectors. After multiplying gamma and p. I have to plot values of f and p at every iteration. I will plot the values of f and gamma then I will decide which value of gamma I will use. At the end, I have to use just one value of gamma but first I want to plot the values to find the suitable one.

maxiter = 100;
while iter< maxiter
    p = alpha(:)'*(1-alpha(:));
    gamma = 1Oe-8
    f = gamma * p;
end

[Ahmad Hasnain]

Sorry for not explaining it better. I want to do it like this:

10e-8 , 10e-4, 10e-2, 10e-1, 10e-0.5

Answer 1

[Kevin Phung]

maxiter = 100;
iter = 1;
x = 1:1:99;
n = 8*(1/2).^x; % n = 8 , 4, 2, 0.5,...
while iter< maxiter
    gamma = 10 * 10^(-n(iter)); % 10e-8, 10e-4,...
    f = gamma * p;
    iter = iter + 1;
end

edit: changed x to 1:1:99 instead of 1:1:100