matlab中newff函数的错误：未定义的函数或变量

Question

我编写下面的代码来训练神经网络，但它在最后一行有错误

load('Data.mat');
load('Target.mat');

x = Data';

t = Target';

% Create a Fitting Network

hiddenLayerSize = 20;

TF = 'logsig';  

LF = 'trainlm';

net = newff(inputs,targets,hiddenLayerSize,TF,LF);

错误讯息：

Undefined function or variable 'inputs'.

Error in test1 (line 16)
net = newff(inputs,targets,hiddenLayerSize,TF,LF);