MATLAB: If i want to change each value 1 in a matrix to 0 how to do that

matlab function

a=[1 2 3;1 3 3;2 1 2]

is there a function that make a as below

b=[0 2 3;0 3 3;2 0 2]

b = a;
b(b==1) = 0;

phi=.1;%not sure what you what
alpha=2*log(10);
f=4;
A=1;
t=0:.001:1;
f=@(t)A*exp(-alpha*t).*cos(2*pi*f*t+phi);
plot(t,f(t));

How about:

A = [1 2 3 4 5 6];
b = [1 2 3];
C = zeros(size(A'*b));
for ii = 1:length(A)
    C(ii,:) = b + A(ii);
end