Hi again, David:
This might (probably) be related to this previous issue #377 (comment)
When I get raw matrices for a same chromosome using the TADbit Python API and using TADbit tools bin the matrices that I get are quite different. You can also see that the matrix obtained with the TADbit API is more dense.
MATRIX FROM TADBIT TOOLS:

MATRIX FROM API:

You can also see the first 10x10 entries for both matrices: Some cells contain the same values, but others just don't. Some are different by orders of magnitude:

Thank you! :)