From the given matrix(6 X 4) how to form a new matrix (12 X 10)

From the given matrix how to form a new matrix.

For example I have a matrix (6 x 4) and I have to form a matrix of (12 x 10)

Given Matrix B = [

1 2 0.0281 35.587

1 4 0.0304 33.222

1 5 0.0064 156.25

2 3 0.0108 92.592

3 4 0.0297 37.670

4 5 0.0297 37.670

];

From the above matrix (b) i have to take the values of column 4 only

Answer should be =

A =

The colours shows in the matrix are the same value rather you can say a matrix of (2x2) in which diagonal elements are +ve and offdiagonal are –ve

for i=1:12

for j=1:10

for k=1:6

%----------------------------------------------%

if i==1 && j==1 && k==1

A(i,j+5)=B(k,4)

end

if i==1 && j==2 && k==1

A(i,j+5)=-B(k,4)

end

if i==2 && j==1 && k==1

A(i,j+5)=-B(k,4)

end

if i==2 && j==2 && k==1

A(i,j+5)=B(k,4)

end

%--------------------------------------------%

Logic for rest of the matrix is same.............

Though I have done it in above way but it is not generalized. not clicking with the logic..

Please Any Body Can Help