ISAXISHANDLE Check if the input corresponds to a valid axis handle.

   B = isAxisHandle(VAR)
   If the value of VAR is scalar, corresponds to a valid matlab handle,
   and has type equal to 'axis', then returns TRUE. Otherwise, returns
   false.
   This function is used to check if first argument of drawing functions
   corresponds to data or to axis handle to draw in.

   Example
     isAxisHandle(gca)
     ans =
         1

   See also
   drawPoint, drawLine, drawEdge

 ------
 Author: David Legland
 e-mail: david.legland@grignon.inra.fr
 Created: 2012-09-21,    using Matlab 7.9.0.529 (R2009b)
 Copyright 2012 INRA - Cepia Software Platform.

Package: matgeom