is_handle_valid

Arguments

h

Matrix of graphic handles

isValid

Matrix of boolean with the same size as h

Description

is_handle_valid function tests whether 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 — delete a graphic entity and its children.
• graphics_entities — описание структур данных графических объектов