5.1.13 defined
--------------

Syntax:
defined ( name )
Type:
int
Purpose:
returns a value <>0 (TRUE) if there is a user-defined object with this name,
and 0 (FALSE) otherwise.

A non-zero return value is the level where the object is defined (level
1 denotes the top level, level 2 the level of a first procedure, level 3
the level of a procedure called by a first procedure, etc.). For ring
variables, -1 is returned.
Note:
A local object m may be identified by if
(defined(m)==voice).
Example:
  ring r=(0,t),(x,y),dp;
  matrix m[5][6]=x,y,1,2,0,x+y;
  defined(mm);
==> 0
  defined(r) and defined(m);
==> 1
  defined(m)==voice;   // m is defined in the current level
==> 1
  defined(x);
==> -1
  defined(z);
==> 0
  defined(t);
==> -1
  defined(42);
==> -1
See
rvar;
voice.
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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
generated by <a href="http://www.gnu.org/software/texinfo/"><i>texi2html</i></a>.
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