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

Lionoon

k=1;
p=[-1:.05:8];
t=1+sin(k*pi/4*p);
3 C! F+ N" ~3 v( S6 l, P4 Uplot(p,t,'-');
) ^  U) y4 v% r* H7 V2 p1 Ptitle('要逼近的非线性函数');
xlabel('时间');
* M# L+ N- q+ A5 _ylabel('非线性函数');
n=3;
( [6 O) D2 w" E( L5 n5 S, u6 _net = newff(minmax(p),[n,1],{'tansig''purelin'},'trainlm ')

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刚开始学bp网络，编译了个程序，报错
3 @: h) w7 H7 YInvalid function name 'tansig'purelin'.

Error in network/subsasgn>getDefaultParam (line 2023)
    param = struct(feval(fcn,'defaultParam'));

: R3 K1 N  E4 d4 \4 s4 EError in network/subsasgn>setLayerTransfeRFcn (line 1199)
5 u& L$ w- |$ C) {; ^  S9 pnet.layers{i}.transferParam = getDefaultParam(transferFcn);
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& L2 R3 P& e7 g6 J2 a8 rError in network/subsasgn>network_subsasgn (line 183)
        if isempty(err), [net,err] = setLayerTransferFcn(net,i,transferFcn); end
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Error in network/subsasgn (line 13)
net = network_subsasgn(net,subscripts,v,netname);
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Error in newff>new_5p0 (line 286)
  net.layers{i}.transferFcn = tf{i};
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Error in newff>create_network (line 128)
" p3 z: e9 v2 E6 _3 x  net = new_5p0(varargin{:});

Error in newff (line 102)
  out1 = create_network(varargin{:});
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CCxiaom

不太知道这是要实现什么功能