Welcome to the documentation of NaMaster's C API. Navigate through the tabs above to learn more about the different functionality implemented in the code.

General notes

• Most users will prefer to use the python wrapper "pymaster", which mostly calls the C-based functions.
• NaMaster uses a "row-major" order to define the ordering of power spectra into vectors. E.g. the cross-correlation of two spin-2 fields 'a' and 'b' would give rise to 4 power spectra: Ea-Eb, Ea-Bb, Ba-Eb and Ba-Bb. These are stored into 1-dimensional arrays using exactly that order. For the case of a spin-0 - spin-2 correlation, the ordering is [T-E, T-B], where T is the spin-0 field and (E,B) are the harmonic components of the spin-2 field.
• The abbreviation MCM will often be used instead of "mode-coupling matrix".
• SHT will sometimes be used for "Spherical Harmonic Transform". In the context of flat-sky fields, this should be understood as a standard Fast Fourier Transform (FFT) (with appropriate trigonometric factors if dealing with spin-2 fields).
• FWHM will sometimes be used for "Full-width at half-max".

More info

Please refer to the README and LICENSE files for further information on installation, credits and licensing. Do not hesitate to contact the authors (preferably via github issues on https://github.com/LSSTDESC/NaMaster) if you encounter any problems using the code.