ISNOMINAL  Tests if a pipeline was created from a nominal data set

   I=ISNOMINAL(P)

 INPUT
   P      trained sdppl pipeline

 OUTPUT
   I      logical value

 DESCRIPTION
 ISNOMINAL returns 1 is the pipeline P expects on its input a data set
 with nominal representation. Because the input of P is checked, the P(1)
 step in sequential pipelines determines the response.  Note, that I==1
 does not necessarily mean that the classifier p is capable of using
 nominal features. It only means, that nominal representation was used in
 training and is needed to execute this pipeline.  For example, Fisher
 classifier trained on nominal data set would yield I==1.

 SEE ALSO
 SDNOMINAL