[求助]不知道出了什么问题，请指点。

net=newsom(minmax(AVEMT),[5,5],gridtop)

??? Error using ==> network.subsasgn
"layers{1}.topologyFcn" must be the name of a topology function.

Error in ==> newsom at 110
net.layers{1}.topologyFcn = tfcn;

Error in ==> RESULT at 301
net=newsom(minmax(AVEMT),[5,5],gridtop);