Use prediction for concrete compressive strength is the regression problem with neural network in matlab?

Hello every body i have a trouble in matlab home work .... iam new user of matlab so that i don't have any experience with it . my job is to learn a neural network that can be used to predict the strength of the concrete based on some attributes. The data set i sould work with here in this link :: http://elearning.yu.edu.jo/lms/pluginfile.php/14195/mod_assign/intro/Concrete_Data.xls I need to Know what is the clearly steps to solve that problem ? I have started to learn using matlab , but i can't find anything over internet help me in my homework .....

Answer 1

[Shashank Prasanna]

Start with the examples in the documentation:

http://www.mathworks.com/help/nnet/fitting-functions-and-data.html

The toolbox offers several intuitive GUIs to help you get started. Try the following to start with:

>> nftool

[sanaa]

I've tried it and since i select the data file this error appears

errmsg =

Subscripted assignment dimension mismatch

[sanaa]

Train neural network .. what is that mean ??

[Shashank Prasanna]

Training is the phase the neural network is 'Learning'. I really recommend going through some standard texts in this area so that it becomes easier for you to use the toolbox. Although the GUI does not require you to know neural network works, it helps to understand the limitations and what types of problems can be solved.

[sanaa]

can you provide a simple code to create NN with parameter initialization , weights , eta , error threshold and iteration ...

actualy it's complicated to me about how to start with simple and good example

[sanaa]

Thank's for advices :))

[Shashank Prasanna]

Again there are a lot of examples in the documentation, scroll down to see some GUI examples as well a code. The advantage of such examples are that you can run them to understand how the code works and then modify them for your application.

http://www.mathworks.com/help/nnet/gs/fitting-a-function.html http://www.mathworks.com/help/nnet/ug/create-configure-and-initialize-the-network.html

[sanaa]

Thank you a lot ;)

[sanaa]

After using GUI example i've tried to use the code generated in command line but it dosen't work ... i followed the instruction carefully in this link http://www.mathworks.com/help/nnet/ug/create-configure-and-initialize-the-network.html

can you help ..

[Greg Heath]

Bestif you show your commented code eith error mesasages and name a MATLAB nndata file.

[sanaa]

I think it's work this output ,, do you if thi output seem good nndata =

        net: [1x1 network]
       info: [1x1 struct]
     output: [1x1030 double]
      error: [1x1030 double]
      input: [9x1030 double]
    target1: [1x1030 double]

how i can plot the output ??