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From: Kostas Ioannou on 7 Jan 2010 06:05
Hello To MATLAB COMMUNITY!!!
I’m new in matlab (using 2009b) and I have a couple of questions.
I’m trying to use the nntool and the nftool to make some predictions using ANNs.
The problems are the following:
1. when I try to use the nntool, MATLAB makes 100% correct predictions. Is this right ?
2. when I use the same data set in nftool, predictions vary between 0.5 and 0.9
3. even if the nntool works as it is supposed to, how can I use a bigger matrix (after the initial training) in input data, so I can predict a bigger matrix in target data ?
4. Are there any good tutorials I can read in order to improve my use in the Neural Networks toolbox ?

Thank you in advance!

PS
The Initial Input matrix has 28 elements
The Initial Target matrix has 28 elements
The Second Matrix which I want to use for input after the training has 35 elements and I want matlab to create a new target matrix with 35 elements.
From: Abdullah on 7 Jan 2010 21:45
"Kostas Ioannou" <hexdec(a)hexdec.gr> wrote in message <hi4f5g$nhg$1(a)fred.mathworks.com>...

Hi kostas!
I am working with neural network as well.

> 1. when I try to use the nntool, MATLAB makes 100% correct predictions. Is this right ?

I think you have used newff() to make a network and then sim() to check output. Right?
If yes then I think you need to train the network and after training you will know how accurate the network is performing.

Abdullah,
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