MATLAB: Reshaping matrix with odd number of total elements

reshape

how can I reshape a 63X5 matrix (315 elements) into a mX2 , and a mX4 matrix?

W = [M(:,[34]), M(:,1)*M(:,4)-M(:,2)*M(:,3)];

for K = 1 : 1   %it's a loop
  C3 = {C1{1,1} C2{1,1} C1{1,2} C2{1,2} C1{1,3} C2{1,3} C1{1,4} C2{1,4}};
end

Alternately, and less efficiently,

C3 = cell(1,8);
for K = 1 : 4
  C3(2*K-1) = C1(1,K);
  C3(2*K) = C2(1,K);
end

You can cell2mat(C3) but you are going to get out a plain numeric array, 2 x 16 . If you prod() that, you would get out a 1 x 16 result.