NAME
    isident - returns 1 if matrix is an identity matrix

SYNOPSIS
    isident(m)

TYPES
    m		mat

    return	int

DESCRIPTION
    This function returns 1 if m is an identity matrix, 0 otherwise.

EXAMPLE
    XXX - fill in

LIMITS
    m must be a 2 dimensional matrix

LIBRARY
    none

SEE ALSO
    isassoc, isfile, isint, islist, ismat, isnull, isnum, isobj,
    isreal, isstr, issimple, istype