function W = normw(W)

if nargin ~= 1
    error('normw: Wrong # of input arguments');
end;
[n1 n2] = size(W);
if n1 ~= n2,
error('normw: W matrix must be square');
end;
  n = ndims(W);
  nterm = sum(W, n);
  nterm = repmat(nterm,[ones(1,n-1) size(W,n)]);
  % protect against zeros before dividing
  nterm = nterm + (nterm==0);
% use the same W as output here to save RAM
  W = W ./ nterm;

调用时一直在报错
错误使用 normw (line 24)
normw: Wrong # of input arguments
这是什么原因呀？
matlab新手，求各位大神赐教！！拜托拜托