pspy

pspy is a cosmology code for calculating CMB power spectra and covariance matrices. See the python example notebooks for an introductory set of examples on how to use the package.

• Free software: BSD license
• pspy documentation: https://pspy.readthedocs.io.
• Scientific documentation: https://pspy.readthedocs.io/en/latest/scientific_doc.pdf

Installing

pip install pspy [--user]

You can test your installation by running

test-pspy

If everything goes fine, no errors will occur. Otherwise, you can report your problem on the Issues tracker.

If you plan to develop pspy, it is better to checkout the latest version by doing

git clone https://github.com/simonsobs/pspy.git /where/to/clone

Once downloaded, you can install using pip install . inside the project directory. We use the meson build system, which should be understood by pip (it will build in an isolated environment).

To run an editable install, you will need to do so in a way that does not have build isolation (as the backend build system, meson and ninja, actually perform micro-builds on usage in this case):

Then you can install the pspy library and its dependencies via

pip install --upgrade pip setuptools meson ninja meson-python numpy
pip install --no-build-isolation --editable /where/to/clone

The -e option allow the developer to make changes within the pspy directory without having to reinstall at every changes.

Tutorials notebooks

• Reading, writing and plotting maps
• Generate spin0 and spin2 spectra for CAR
• Generate spin0 and spin2 spectra for HEALPIX
• Projecting HEALPIX to CAR
• Compute spectra for standard and pure B modes

Others tutorials can be found under the tutorials directory.

Dependencies

• Python ≥ 3.10
• pixell https://pixell.readthedocs.io

Authors

• Thibaut Louis
• Steve Choi
• DW Han
• Xavier Garrido
• Sigurd Naess
• Adrien La Posta

The code is part of PSpipe the Simons Observatory power spectrum pipeline.