MATLAB Answers


How to train data in Neural Network

Asked by Turki
on 13 Nov 2013
Latest activity Commented on by Nadiah Zainudin on 14 Nov 2017 at 4:02

Hi all,

I am working on neural network to study cancer data, which has 680 record and labels. I just want to study the data and classify them to e classes. I've tried to write a code on matlab and I got result. But I don't know if it's correct or not.

So could you help me?

Thanks in advance.

close all, clear all, format compact 
[num]= xlsread('Cdata2.xlsx');
[r,c] = size(num);          
x = num(: ,1:c-1);
t = num(:,c);
inputs = x';
targets = t';
% Create a Pattern Recognition Network
hiddenLayerSize = 10;
net = patternnet(hiddenLayerSize);
% Set up Division of Data for Training, Validation, Testing
net.divideParam.trainRatio = 70/100;
net.divideParam.valRatio = 15/100;
net.divideParam.testRatio = 15/100;
% Train the Network
[net,tr] = train(net,inputs,targets);
% Test the Network
outputs = net(inputs);
errors = gsubtract(targets,outputs);
performance = perform(net,targets,outputs);
perf = mse(net,targets,outputs);
% View the Network
figure, plotregression(targets,outputs)
% Uncomment these lines to enable various plots.
%figure, plotperform(tr)
%figure, plottrainstate(tr)
figure, plotconfusion(targets,outputs)
%figure, ploterrhist(errors)

  1 Comment

Can i ask what are the outputs for? What are you testing for?

Log in to comment.

1 Answer

Answer by Greg Heath
on 14 Nov 2013
 Accepted Answer

You need to

 1. Initialize the RNG before train so that you can duplicate your results
 2. Convert your output to percent error rates or correct classification rates for 
    the train/val/test subsets of each class.
 3. Search using
    greg patternnet
 for some examples.

Hope this helps.

Thank you for formally accepting my answer


P.S. If you try your code on one of the MATLAB classification examples, we can compare results

help nndatasets


About the first point: what is the benefit of using random number generation?

I didn't understand enough the second point. How can I classify the three sets correctly?!

Thank you

Hi Greg,

Can you help me please? I am new in this field and I'm really lost here.


Sorry I missed you in Nov. I usually search on the word "neural".

Any more questions?

Log in to comment.

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today