> The Spider Objects

>            DATA object

>        Stores data into two components X (input) and Y (output).

>        An object is created with:
>          data('name',X,Y);
>              or
>          data(X,Y); (no name)
>              or
>          data(X); (in case there's no output, e.g clustering)

>        Public attributes:
>         X          -- input matrix
>         Y          -- output matrix
>         index      -- original parent indices of examples
>         findex     -- original parent indices of features

>        Public methods:
>         d=get(data,index,featInd)             -- return data,index only (ind)examples,(find)features
>         x=get_x(data,index,fInd)              -- return x,index only (ind)examples,(find)features
>         y=get_y(data,index,fInd)              -- return y,index only (ind)examples,(find)features
>         d=set_x(data,X,indes,featInd)         -- set inputs indexed by (ind)examples,(find)features
>         d=set_y(data,Y,index,featInd)         -- set outputs indxed by (ind)examples,(find)features
>         [indes,featInd]=get_index(d)          -- returns example and feature indices
>         [numEx,vDim,oDim,numCls]=get_dim(d)   -- returns number of examples,features,output dimensions,classes

>        Example:
>                      get_x(data([1:5;6:10;11:15]),[1 3],[3:5])