ishandle - Test for valid graphics object handle

Syntax

Description

ishandle(H) returns an array whose elements are 1 where the elements of H are valid graphics or Sun Java object handles, and 0 where they are not.

Non-Graphics Object Handles

Use the isa function to determine the class of MATLAB objects and use the isvalid handle class method to determine the validity of handle objects. See Testing Handle Validity for information on testing for MATLAB handle objects.

Examples

Ensure that an input argument is the handle to a graphics object.

function updateLine(h,x,y)

   if ishandle(h)
      set(h,'XData',x,'YData',y)
      ...
   else
      line('XData',x,'YData',y);
      ...
   end
end

See Also

findobj | gca | gcf | gco | isa | set

How To

• Accessing Object Handles

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