Question: Is incremental addition and deletion supported?

[allComputableThings]

Sometimes, its helpful to be able to incrementally add (and sometime delete) to a NN map. Is this supported?

[masajiro]

You can remove and add objects.

Append:
https://github.com/yahoojapan/NGT/tree/master/bin/ngt#append
https://github.com/yahoojapan/NGT/blob/master/python/README-ngtpy.md#insert

Remove:
https://github.com/yahoojapan/NGT/tree/master/bin/ngt#remove
https://github.com/yahoojapan/NGT/blob/master/python/README-ngtpy.md#remove

[saicomagic]

What's the difference between append and insert?
https://github.com/yahoojapan/NGT/wiki/Cpp-Quick-Reference#size_t-appendstdvectortype-object
https://github.com/yahoojapan/NGT/wiki/Cpp-Quick-Reference#size_t-insertstdvectortype-object

If the index is constructed with read only mode, is it able to incrementally add or remove?

Many thanks

[masajiro]

NGT has an object list to manage objects. append() always adds the given object at the end of the list. The retuned object ID always increases by one for each appending. If the list has no empty entries for removed objects, insert() is the same as append(). However, if the list has empty entries for removed objects, insert() inserts the given object into the empty entry to save the memory space. Note that the ID of the given object must be discontinuous, because the empty entry ID is assigned to the given object.

You cannot construct the index with read only mode.

[saicomagic]

NGT has an object list to manage objects. append() always adds the given object at the end of the list. The retuned object ID always increases by one for each appending. If the list has no empty entries for removed objects, insert() is the same as append(). However, if the list has empty entries for removed objects, insert() inserts the given object into the empty entry to save the memory space. Note that the ID of the given object must be discontinuous, because the empty entry ID is assigned to the given object.

You cannot construct the index with read only mode.

Get it! Thanks for your prompt reply.