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Hi, can anybody help with some guidance on neural network for classification ?

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Nawaz Pasha
Nawaz Pasha on 25 May 2014
Commented: Greg Heath on 6 Jun 2014
I'm working on optical character recognition problem. I've successfully extracted features which is a [1X32] matrix ('ve extracted 32 features from each segmented character). I've the complete training data set (the images of every individual character), but the problem is that I am not getting how to create Input & Target data set matrices.
Any help would be greatly appreciated.


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Accepted Answer

Greg Heath
Greg Heath on 26 May 2014
In general
[ I N ] = size(input) % I = 32
[ O N ] = size(target) % O = 36
where the columns of target are columns of eye(36).
go to
help nndatasets
doc nndatasets
to see how the matrices of the classification examples are set up.
Hope this helps
Thank you for formally accepting my answers


Nawaz Pasha
Nawaz Pasha on 26 May 2014
Mr. Heath thank you for your answer.
I've few more simple questions since i'm a newbie to matlab hope you would be helpful.
1)There are 258 different patterns (characters), so, should there be 258 class labels ?
My input matrix size is No. of rows = 32 (features) No. of cols = 258*4=1032 (No of characters*No of instances for each character)
2) what should be the size of my target matrix ? Just draw a dummy target matrix for my case.
Thanks in advance..
Greg Heath
Greg Heath on 6 Jun 2014
I don't understand the 258. 36 is the typical count for English 26(A-Z)+10(0-9) or perhaps 62 if lower case (a-z) is allowed. Well, even more if punctuation marks are included.

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