appendCrds()
Append a new coordinate/usrIds to the end of an old set. Also, return an inverse map from the new usrIds to the extended vector.
Parameters
- newUsrIds (array)
- An array of new user indices.
- newCrd (array)
- An array of new coordinates.
- oldUsrIds (array)
- An array of old user indices.
- oldCrd (array)
- An array of old coordinates.
Return Value
- usrIds (array)
- New user indice.
- crd (array)
- New coordinates.
- newInvMap (array)
- Inverse map from new usrIds to new 0 based index.