MATLAB: Emptying each row of matrix of a in a loop then uses respective matrices produced from it to get a certain value

Question

I have a matrix, a

a = [1 2;
    1 3;
    1 5; 
    1 7;
    1 8;];

and this matrix a, is emptied in each row per loop until the last one using this code from Matt J

a0=a;
for i=1:size(a,1)
    a=a0;
    a(i,:)=[],
end

which result in:

a = [1 3;
    1 5; 
    1 7;
    1 8;];
a = [1 2;
    1 5; 
    1 7;
    1 8;];
a = [1 2;
    1 3;
    1 7;
    1 8;];
a = [1 2;
    1 3;
    1 5; 
    1 8;];
a = [1 2;
    1 3;
    1 5; 
    1 7;];

can I create another loop to calculate a certain value, w, from the results from each loop beginning with the orginal until the last one. After each loop answer value, w, is tabulated in matrix b

b = [w
    w
    w
    w
    w
    w]

there 6 values of w since we consider the orginal a

Answer 1

Why not as follows,

b=nan(size(a,1),1); %pre-allocate
for i=1:size(a,1)
    
    tmp=a;
    tmp(i,:)=[],
    
    b(i)=max(tmp(:))-min(tmp(:)); %example derived quantity
    
end