> The Spider Objects

>            MAP object

>        A=MAP(H) returns a map object initialized with hyperparameters H.

>         MAP is a general object for mapping data, it takes a supplied
>         mapping function which can transform the given input data. The
>         function can use four hyperparmeters p1,p2,p3,p4.

>         Hyperparameters, and their defaults

>          func='d.X=tanh((d.X+a.p1)*a.p2)' -- function we wish to use.
>                                            This can be changed at will,
>                                            it can access the object 'd' (data)
>                                            and 'a' (mapping algorithm), e.g
>                                            d.X, d.Y, a.p1, a.p2, etc. and
>                                            usual matlab functions. It should
>                                            store the new values in d.X.
>                                             The default is a sigmoid mapping.
>          p1=1,p2=0,p3=[],p4=[]          -- user parameters