Invalid function name 'tansig'purelin'.报错求救

Lionoon

k=1;
' u0 G/ f; j1 B/ \0 jp=[-1:.05:8];
) q: P0 k1 o* h0 N% E6 G2 g. H$ A8 It=1+sin(k*pi/4*p);
plot(p,t,'-');
* z9 K. _: e$ Q$ T+ K$ e  }title('要逼近的非线性函数');
xlabel('时间');
ylabel('非线性函数');
n=3;
) G( S  x4 _* e( g. g2 v- ?8 Xnet = newff(minmax(p),[n,1],{'tansig''purelin'},'trainlm ')
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' I' q. i* w+ H+ R6 _1 w刚开始学bp网络，编译了个程序，报错
8 L# X. x$ V- \4 u- I6 o, }: }3 IInvalid function name 'tansig'purelin'.
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Error in network/subsasgn>getDefaultParam (line 2023)
    param = struct(feval(fcn,'defaultParam'));

; }% t% C9 ~/ h' n* rError in network/subsasgn>setLayerTransfeRFcn (line 1199)
$ o2 }( W' ]' B, K3 X  Znet.layers{i}.transferParam = getDefaultParam(transferFcn);

, w% B4 o( q  Y% G+ FError in network/subsasgn>network_subsasgn (line 183)
        if isempty(err), [net,err] = setLayerTransferFcn(net,i,transferFcn); end

Error in network/subsasgn (line 13)
net = network_subsasgn(net,subscripts,v,netname);
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7 b# a4 {: p6 V1 c& c  }' `Error in newff>new_5p0 (line 286)
  net.layers{i}.transferFcn = tf{i};

Error in newff>create_network (line 128)
  net = new_5p0(varargin{:});
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# {8 i+ y3 F" Z. L, P4 q! tError in newff (line 102)
5 s  l( ?: \4 Z: N  out1 = create_network(varargin{:});
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CCxiaom

不太知道这是要实现什么功能