MATLAB File Help: HebiGroup/isvalid
 isvalid   Test handle validity.
    TF = isvalid(H) performs an element-wise check for validity on the 
    handle elements of H.  The result is a logical array of the same 
    dimensions as H, where each element is the element-wise validity 
    A handle is invalid if it has been deleted or if it is an element
    of a handle array and has not yet been initialized.

Help for HebiGroup/isvalid is inherited from superclass handle
See also
Method Details
Defining Class handle
Access public
Sealed true
Static false