Replace and add element under specific condition

if i have this a (n,m) tow matrix A and B for example

A = [ 1 0 1 0 1
      0 1 0 1 1
      1 1 1 0 0
      1 0 0 1 1
      1 1 0 0 1 ]

B = [ 1 0 1 0 1
      0 0 0 0 1
      1 0 0 0 0
      1 0 0 0 1
      1 1 0 1 1]

I need function to do this steps

w = B(1,:)      % extract first row 

 for k:1:size(w) 
  if there is one in w(k) then go back to Matrix A(1,k) 
     chick if there is a one's beside it >> true 
        set in Matrix B(k) these one's 

for example B(3,:) is [1 0 0 0 0]  then go back to A(3,:) = [1 1 1 0 0] 

 then we check if there are one's neighbors to that one >> if yes 
        then put the same number of one's beside the first one and update B(3,:)

            so B(3,:) will be [1 1 1 0 0]

• Note : can't we say B(3,:) | A(3,:) because for example

   the B(end,:) = [ 1
                    1
                    0
                    1
                    1 ]

then we chick A(2,end) [0 1 0 1 1] >> we see there is a just one beside it so the update on the second row in B will be like this [ 0 0 0 1 1]

[Azzi Abdelmalek]

This is not clear

Answer 1

[Image Analyst]

How about this, which uses morphological reconstruction:

marker = B;
mask = A;
C = imreconstruct(marker,mask, 4)

C =
     1     0     1     0     1
     0     1     0     1     1
     1     1     1     0     0
     1     0     0     1     1
     1     1     0     0     1

[Firas Al-Kharabsheh]

What number 4 mean ?

[Walter Roberson]

http://www.mathworks.com/help/images/ref/imreconstruct.html#inputarg_conn

[Firas Al-Kharabsheh]

no Mr Walter the c(2,2) must be zero ,, because its not neighbor to the last one in this row ,, there is zero between them