|  |  5.1.115 parstr 
See
 charstr;
 npars;
 ordstr;
 ring;
 varstr.Syntax:parstr (ring_name)
 parstr (int_expression)
 parstr (ring_name,int_expression)Type:string
Purpose:returns the list of parameters of the ring as a string
or the name of the n-th parameter where n is given by the int_expression.
If the ring_name is omitted, the basering is used, thus
 parstr(n)is equivalent toparstr(basering,n).Example:|  |   ring r=(7,a,b,c),(x,y),wp(2,3);
  parstr(r);
==> a,b,c
  parstr(2);
==> b
  parstr(r,3);
==> c
 | 
 |