我用MATLAB的simulink做无线信道建模，求误码率出了问题
建模完成后，程序源代码出错，如下，关键是我没用到sum函数啊，求高手指点for i=1:length(x)
SNR=x(i);
sim('jiawu');
y(i)=mean(BitErrorRate);
end
semilogy(x,y);
??? Function 'sum' is not defined for values of class 'struct'.
Error in ==> sum at 41
= builtin('sum', varargin{:});
Error in ==> mean at 29
y = sum(x)/size(x,dim);
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