% empty final matrix
m = [];

% value in matrix
s = 0;

% iterate over all rows
for i=1:8
    if (mod(i,2) == 1)   % odd rows
        columnvector = 1:8;
    else   % even rows
        columnvector = 8:-1:1;
    end
    for j=columnvector
        m(i,j) = s;
        s = s + 1;
    end
end

m

image(m), colormap(jet(64));