Why does the Neural Network Pattern Recognition Tool GUI not list my workspace variable for target data in Neural Network Toolbox 7.0.3 (R2012a)?

I have two workspace variables, a and b as follows

a=rand(10,200);

b=rand(1,200);

When I launch the NPRTOOL, I can see the workspace variables in "Inputs" but not for "Targets". I tried to import the variable as a MAT file but it still does not show up as a variable to select.

Answer 1

[MathWorks Support Team]

The target variable for Neural Network Pattern Recognition Tool in Neural Network Toolbox 7.0.3 (R2012a) needs to be a matrix of ones or zeros indicating which class the corresponding input belongs to. For example, the variable could be as follows:

>> target_var=[ 1 0 0 0;

              0 0 1 0;

              0 1 0 1];

where first column represents class 1; second column means class 3, and so on.

In case you need to convert your already defined class matrix (one-

dimensional) to a matrix of appropriate ones and zeros, you can do it as follows:

>>  ind = [1 3 2 3] ;

>> vec = ind2vec(ind) ;

>> target_var = full(vec) 

ans = 

       1     0     0     0 

       0     0     1     0 

       0     1     0     1

which you can then use as variable for your "Targets".

You can also have a look at the variables which were used in the Example Data Sets. Please click "Load Example Data Set". The Pattern Recognition Data Set Chooser window opens. Choose a data set, for example. "Breast Cancer", and click Import. You can then view these variables in the workspace.