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 
    result.
 
    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