Interface Summary

This chapter briefly summarizes MSG’s Python, Fortran and C interfaces.

Python Interface

The Python interface is designed around the pymsg.SpecGrid and pymsg.PhotGrid classes, which support interpolation of spectroscopic and photometric data, respectively. The table below summarizes the mapping between the various quantities defined in the MSG Fundamentals chapter, and the methods provided by these classes.

Table 1 Python Interpolation Routines

Symbol	Quantity	Method
\(\intsy\)	Spectroscopic specific intensity	pymsg.SpecGrid.intensity()
\(\emom\)	Spectroscopic E-moment	pymsg.SpecGrid.E_moment()
\(\pmom\)	Spectroscopic P-moment	pymsg.SpecGrid.P_moment()
\(\irrad\)	Spectroscopic irradiance	pymsg.SpecGrid.irradiance()
\(\flux\)	Spectroscopic flux	pymsg.SpecGrid.flux()
\(\mintsy/\fluxz\)	Photometric specific intensity, normalized by zero-point flux	pymsg.PhotGrid.intensity()
\(\memom/\fluxz\)	Photometric E-moment, normalized by zero-point flux	pymsg.PhotGrid.E_moment()
\(\mpmom/\fluxz\)	Photometric P-moment, normalized by zero-point flux	pymsg.PhotGrid.P_moment()
\(\mirrad/\fluxz\)	Photometric irradiance, normalized by zero-point flux	pymsg.PhotGrid.irradiance()
\(\mflux/\fluxz\)	Photometric flux, normalized by zero-point flux	pymsg.PhotGrid.flux()

Fortran Interface

The Fortran interface is designed around the specgrid_t and photgrid_t derived types, which support interpolation of spectroscopic and photometric data, respectively. The table below summarizes the mapping between the various quantities defined in the MSG Fundamentals chapter, and the type-bound procedures provided by these types.

Table 2 Fortran Interpolation Routines

Symbol	Quantity	Procedure
\(\intsy\)	Spectroscopic specific intensity	specgrid_t%intensity()
\(\emom\)	Spectroscopic E-moment	specgrid_t%E_moment()
\(\pmom\)	Spectroscopic P-moment	specgrid_t%P_moment()
\(\irrad\)	Spectroscopic irradiance	specgrid_t%irradiance()
\(\flux\)	Spectroscopic flux	specgrid_t%flux()
\(\mintsy/\fluxz\)	Photometric specific intensity, normalized by zero-point flux	photgrid_t%intensity()
\(\memom/\fluxz\)	Photometric E-moment, normalized by zero-point flux	photgrid_t%E_moment()
\(\mpmom/\fluxz\)	Photometric P-moment, normalized by zero-point flux	photgrid_t%P_moment()
\(\mirrad/\fluxz\)	Photometric irradiance, normalized by zero-point flux	photgrid_t%irradiance()
\(\mflux/\fluxz\)	Photometric flux, normalized by zero-point flux	photgrid_t%flux()

C Interface

The C interface is designed around the SpecGrid and PhotGrid typedefs, which support interpolation of spectroscopic and photometric data, respectively. The table below summarizes the mapping between the various quantities defined in the MSG Fundamentals chapter, and the functions that operate on these types.

Table 3 C Interpolation Routines

Symbol	Quantity	Function
\(\intsy\)	Spectroscopic specific intensity	interp_specgrid_intensity()
\(\emom\)	Spectroscopic E-moment	interp_specgrid_E_moment()
\(\pmom\)	Spectroscopic P-moment	interp_specgrid_P_moment()
\(\irrad\)	Spectroscopic irradiance	interp_specgrid_irradiance()
\(\flux\)	Spectroscopic flux	interp_specgrid_flux()
\(\mintsy/\fluxz\)	Photometric specific intensity, normalized by zero-point flux	interp_photgrid_intensity()
\(\memom/\fluxz\)	Photometric E-moment, normalized by zero-point flux	interp_photgrid_E_moment()
\(\mpmom/\fluxz\)	Photometric P-moment, normalized by zero-point flux	interp_photgrid_P_moment()
\(\mirrad/\fluxz\)	Photometric irradiance, normalized by zero-point flux	interp_photgrid_irradiance()
\(\mflux/\fluxz\)	Photometric flux, normalized by zero-point flux	interp_photgrid_flux()