Name

is_handle_valid — Check wether a set of graphic handles is still valid.

Calling Sequence

isValid = is_handle_valid(h)

Parameters

h

Matrix of graphic handles

isValid

Matrix of boolean with the same size as h

Description

is_handle_valid function tests wether a set of graphic handle is still valid. A valid handle is a handle which has not been deleted. The result, isValid, is a boolean matrix such as isValid(i,j) is true if h(i,j) is valid and false otherwise.

Examples

    // check that current objects are valid
    is_handle_valid([gcf(), gca(), gce()])

    // create 11 polylines
    plot([0:10; 0:10; 0:10], [0:10; 0:0.5:5; 0:2:20]);
    
    // check polylines validity
    axes = gca();
    polylines = axes.children(1).children
    is_handle_valid(polylines)
    
    // delete some polylines
    delete(polylines(3:7));
    // print validity
    is_handle_valid(polylines)
    
  

See Also

delete , graphics_entities

Authors

Jean-Baptiste Silvy INRIA