How can I perform the following operation in matrix

A=[2 3 4 5; 4 5 6 7; 3 4 5 6; 3 4 2 1] to get matrix B=[ 2 3 4 5; 4 20 18 7; 3 16 15 6; 3 4 2 1] the outer number remain as it was while the inner element is multiplied by the first row starting by the first element from the end. Matrix A is a square matrix of n dimensions. This is what I have tried so far

[m, n] = size(A); A= double(A);

for i=1:m
 for j=1:n
   if (j==1 && i==1)
    B(i,j)= A(i,j);
     elseif (i ==m && j==n)
     B(i,j)= A(i,j);
     else
     B(i,j)= A(i,j+1) * A(i-1,n-j);
   end
  end
end

Answer 1

[Bruno Luong]

If I understand correctly

>> A=[2 3 4 5; 4 5 6 7; 3 4 5 6; 3 4 2 1] 

A =

     2     3     4     5
     4     5     6     7
     3     4     5     6
     3     4     2     1
>> B=A

B =

     2     3     4     5
     4     5     6     7
     3     4     5     6
     3     4     2     1

>> B(2:end-1,2:end-1)=B(2:end-1,2:end-1).*B(1,end-1:-1:2)

B =

     2     3     4     5
     4    20    18     7
     3    16    15     6
     3     4     2     1

[dani elias]

thank you, this is what i was looking for