About the number of slots

[DylanWangWQF]

Hi, I have a question about the parameter nslots in the code.
Usually, nslots = dim * dim, then we rotate the ciphertext with nslots.
But if we have the ciphertext with more slots, we cannot do the following operations like rotate.
For example, we have ctxt with 300 slots, but for our 16*16 matrix, we only need 256 slots. You know, in the BGV ciphertext, we cannot choose the exact slots in the ciphertext.

[DylanWangWQF]

Hi, @K-miran . it seems that the number of slots in the ciphertext equals to HEmatpar.nslots. So for the 4*4, 16*16, 64*64 matrix, nslots can only be 16, 256, 4096? If we have the ciphertext with 300 slots for the 16*16 matrix, what should we do? I mean, in the following rotations on ciphertexts, we have to change all of the indexes and mappings? In this case, we have extra 44 slots.

Thanks in advance!