Match two vector and star the 2nd vector with zero value

Hi,

Vectro A has the values of MATH function.

I want to define a vector B that has the same value of A except that B start from zero. In other word, B (i) = 0 if A (i) is not zero until the first zero element comes. Then, B(i) = A(i) for the rest of the vector. where i is the index.

I tried to do this by for loop and if statment but it does not work:

for i = 1:length(Time);
    if A(i) ~=  0 
         B(i)= 0;
         j=i;
     elseif A(i) == 0; 
         for  j = i :length(Time1);
            B(j)= A(j);
         end
         break
      end
      break
end

For example:

If

A = [ 0.6 1 0.4 0 -0.4 -1 -0.4 0.2 0.6 1]

I want

B = [ 0   0 0   0 -0.4 -1 -0.4 0.2 0.6 1]

Answer 1

[Azzi Abdelmalek]

A = [ 0.6 1 0.4 0 -0.4 -1 -0.4 0.2 0.6 1]
idx=find(A==0,1)
B=A;
B(1:idx)=0

[Abdulrahman]

Thank you very much, your answer is really helpful

Can you please tell me, How can I do it if I want vector B to start from the 2nd zero in A or the 3rd zero in A ....ect?

For example: A =[ 0.6 1 0.4 0 -0.4 -1 -0.4 0.2 0.6 1 0 -0.4 0.2 0.6]

B = [ 0 0 0 0 0 0 0 0 0 0 0 -0.4 0.2 0.6]

[Azzi Abdelmalek]

A =[ 0.6 1 0.4 0 -0.4 -1 -0.4 0.2 0.6 1 0 -0.4 0.2 0.6]
zero_position=2;
idx=find(A==0,zero_position);
idx=idx(end);
B=A;
B(1:idx)=0

[Jan]

idx = find(A==0, 2);
B = A;
B(1:idx(2)) = 0;