Database file

Available data

The database file irbasis.h5 in the git repository contains data for Lambda=10, 10², 10³, 10⁴.
You can download an extended database file containing data for Lambda = 10⁵, 10⁶, 10⁷ additionally.

File format

The file format of the database is HDF5. IR basis sets for different parameter sets are stored in different HDF5 groups. Each group sets must have the structure as follows:

Dataset	Type and dimensions	Description
info/Lambda	double	Dimensionless parameter .
info/dim	int	Number of basis functions and singular values (dim).
info/statistics	int	Statistics (1 for fermions and 0 for bosons).
sl	double (dim)	Singular values .
ulx/np	int	Degree of the piece-wise polynomials for (= ).
ulx/ns	int	Number of sections for x ∈ [0, 1] (= ).
ulx/data		Coefficients of the piece-wise polynomials for .
vly/np	int	Degree of the piece-wise polynomials for (= ).
vly/ns	int	Number of sections for y ∈ [0, 1] (= ).
vly/data		Coefficients of the piece-wise polynomials for .

Please see the reference written by N. Chikano, K. Yoshimi, J. Otsuki, H. Shinaoka (in preparation) for details to reconstruct of IR basis functions.