>    Thanks for responding
>    I get the same error." undefined method push for append"
>    Is push a predefined function in the array function library?

Call them "methods".  Array is a class that contains the "push" method.  
That means that *all* arrays necessarily have a push method defined.  
That's part of what the words "class" and "method" imply.


You still haven't sent me a sample code that produces your error.  I 
cannot help you until you do that.

-- 
Daniel Carrera
Graduate Teaching Assistant.  Math Dept.
University of Maryland.  (301) 405-5137