function space = spaceperc(A, k)
% given matrix A and top number k of eigenvalues
% difference in size of A mxn and SVD U,S,V top k in percentage is given
% size U=mxm (mxk), S=mxn (diag k), V=nxn (nxk)
    [m, n] = size(A);
    storA = m * n;
    storAk = (m * k) + k + (n * k);
    space = storAk * 100 / storA;