mmangai 0 Newbie Poster

I am new to probabilistic neural network in mat lab
I have 15 documents and assigned 5 classes each with different keywords..occurrence of that keywords(in character) judges to which class it belongs..
my problem is
How to give it as vector value .since i have keywords rather than numerical value.
please help me
and tell me some site with examples(probabilistic neural network for document classification)
Thanks in advance....