为什么在此 MATLAB 代码中出现“未定义的函数或变量<变量名称>”错误？

问：

load X_Q2.data
load T_Q2.data
x = X_Q2(:,1);
y = X_Q2(:,2);

learningrate = 0.2;
max_iteration = 50;

% initialize parameters
count = length(x);
weights = rand(1,3); % creates a 1-by-3 array with random weights
globalerror = 0;
iter = 0;
while globalerror ~= 0 && iter <= max_iteration
  iter = iter + 1;
  globalerror = 0;
  for p = 1:count
    output = calculateOutput(weights,x(p),y(p));
    localerror = T_Q2(p) - output
    weights(1)= weights(1) + learningrate *localerror*x(p);
    weights(2)= weights(1) + learningrate *localerror*y(p);
    weights(3)= weights(1) + learningrate *localerror;
    globalerror = globalerror + (localerror*localerror);
  end 
end  

我在其他文件中删除了这个 fuunc。

function result = calculateOutput (weights, x, y)
s = x * weights(1) + y * weights(2) + weights(3);
if s >= 0
    result = 1;
else
    result = -1;
end

什么都没有出来。我在命令窗口中取出代码，然后按回车键。窗户上什么都没有。如何获得输出？