# How can I call network

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Hazim Hamad il 2 Mag 2021
Commentato: Jon Cherrie il 6 Mag 2021
I am using nueral network to prdict the output of four inputs ( x1,...x4)
I need to call the netowrk from another matlab file currently i am using save and load the net but this method takes time to load the net do you know any alternative method to call the net please.
x=data(:,1:4)
y=data(:,5)
m=length(y);
Visulaisation of the data
histogram(y,10)
Normalise the features and transform the output
y2=log(1+y)
histogram(y2,10)
plot(x(:,2),y2,'o')
Normalise the input variables
for i=1:4
x2(:,i)=(x(:,i)-min(x(:,i)))/(max(x(:,i))-min(x(:,i)))
end
Train an artificial neural network (ANN)
rng default % For reproducibility
xt=x2'
yt=y2'
hiddenLayerSize=16;
net=fitnet(hiddenLayerSize)
net.divideParam.trainratio=70/100;
net.divideParam.valratio=30/100;
net.divideParam.testratio=0/100;
[net,tr]=train(net,xt,yt)
performance of N.N
yTrain=exp(net(xt(:,tr.trainInd)))-1
yTrainTrue=exp(yt(:,tr.trainInd))-1
sqrt(mean((yTrain-yTrainTrue).^2))
yVal=exp(net(xt(:,tr.valInd)))-1
yValTrue=exp(yt(:,tr.valInd))-1
sqrt(mean((yVal-yValTrue).^2))
gregnet1 = net;
save gregnet1
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### Risposta accettata

Jon Cherrie il 2 Mag 2021
You can use the sim function:
The sim function is usually called implicitly by calling the neural network as a function. For instance, these two expressions return the same result:
y = sim(net,x)
y = net(x)
I think for your case, you need something like this:
x=data(:,1:4)
y=data(:,5)
net = gregnet1;
% Evaluate network on data
xt = x.';
yhat = exp(net(xt)-1).';
% Compare predictions with new data
ytrue = y;
sqrt(mean((yhat-yTrainTrue).^2))
If you want to use the sim function instead of net(xt), then replace the "yhat =" line with
yhat = exp( sim(net,xt) - 1).';
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Hazim Hamad il 6 Mag 2021
Many thanks for your help ; I have a question is the test data is related to unseen data and what is the difference between validation data and testing data and which one is important and can not be excluded from the model please.
Jon Cherrie il 6 Mag 2021
This is an important topic and perhaps too long to cover in answer here. You might be better off with the documentation, e.g., starting from

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