When i tried to change the training function in nntrain , from trainlm to traindx, i get the following error :
Error using fitnet (line 73)
FCN is not the name of a function on the MATLAB path.
I used the below code for changing learning rate and momemtum .
trainFcn = 'traindx';
net.trainParam.lr = 0.5;
net = fitnet(hiddenLayerSize,trainFcn);