1. Approach "Interfacing ITSOL"
2. Approach "Stand-alone implementations"
A few hours ago I got an offer by Yousef Saad and Ruipeng Li to obtain stand-alone implementations of several incomplete factorizations. https://mailman.cae.wisc.edu/pipermail/octave-maintainers/2013-May/033874.htmlI would favor to refactor them to native Octave data types internally and make them directly available as *.oct files for usage. By interfacing the ITSOL library I think there will be a too big memory and time overhead due to data format conversion.