How to form a Single matrix from Multiple matrices by taking perticular element from each matrix.???

Suppose I have a loop

for m=1:8;
a=5+m; b=3*m;
A=[a, b a*b; b, a+b, a-b; 2-a, 3+b a]
end

I will get 8 matrices, now I want to take first element of each matrix to form a column matrix of size 8x1. How to do this?? Please help.....Thanks

Answer 1

[Michael Haderlein]

I guess this particular definition of A is just an example, right? If it's really about these specific values, the final result will just be

 F=(1:8)'+5;

If you cannot take this shortcut, you'll either need to store all A matrices (right now you overwrite them in each iteration) or you save the respective value in each iteration.

Option 1:

 A=zeros(3,3,8);
 for m=1:8
   a=5+m; b=3*m;
   A(:,:,m)=[a, b a*b; b, a+b, a-b; 2-a, 3+b a];
 end
 F=squeeze(A(1,1,:));

Option 2:

 F=zeros(8,1);
 for m=1:8
   a=5+m; b=3*m;
   A=[a, b a*b; b, a+b, a-b; 2-a, 3+b a];
   F(m)=A(1);
 end

[Maruti Patil]

Exact this is what I wanted. Thank you Michael.