GWASpi offers the possibility to import and export its genotype matrices to it’s internal netCDF format. This format is an extremely fast and memory lean way to exchange information between GWASpi applications, taking mere seconds to load where other formats can take minutes or hours.

The GWASpi format is a bundle of 2 files: the genotype matrix itself, in netCDF format and a Sample Info file containing the data concerning the individuals. The genotypes file can alternatively be opened with netCDF’s viewer tool and manipulated with other netCDF APIs.