MATLAB: Why do I get the error Undefined function or variable ‘net’. Error in testalexnet1 (line 16) trainingFeatures = activation​s(net,trai​ningImages​,layer);

Question

I am trying to create my own image data store and this is my code

trainingFeatures = activations(net,trainingImages,layer);

Answer 1

Considering the name of your file testalexnet1 it appears that you missed

net = alexnet;

https://www.mathworks.com/help/nnet/examples/visualize-activations-of-a-convolutional-neural-network.html