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SkyPy: A package for modelling the Universe.

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## Description Allow users to define lambda functions in their configs. Resolve's #318 ## Checklist - [x] Follow the [Contributor Guidelines](https://github.com/skypyproject/skypy/blob/master/CONTRIBUTING.md) - [x] Write unit tests - [ ] Write...

low priority

## Description Write an example reproducing figure 1 in Sudek et al. 2021. ## Inputs - Rykoff model described in issue #517 - DES Y1 data from Drlica-Wagner et al....

enhancement
module: galaxies
examples

## Description Add a function that returns the amplitude of the Schechter function for active galaxies based on equation (17) in de la Bella et al. 2021. ## Inputs -...

enhancement
module: galaxies

## Description Write an example to reproduce Figure 3 in de la Bella et al. 2021. Include sonification feature from [Strauss](https://strauss.readthedocs.io/en/latest/). ## Inputs - Quenching model described in issue #513...

enhancement
module: galaxies
examples

## Description Add a feature where we can obtain the Schechter parameters for active galaxies (centrals and satellites) and passive galaxies (mass- and satellite-quenched) based on equation (15) in de...

enhancement
module: galaxies

We should consider making `resolution` a required argument of the `schechter` sampler and other functions that call it. Currently default values are being used throughout the library e.g. `schechter_lf` but...

enhancement
module: galaxies
module: utils

It was noted in the review for our JOSS paper that the keyword argument `noise` for the function `redshifts_from_comoving_density` has a misleading name. See the review comment [here](https://github.com/openjournals/joss-reviews/issues/3056#issuecomment-877270540). They suggested...

enhancement
good first issue
module: galaxies
low priority

**Describe the bug** When working in the skypy\halos module, the maximum and minimum mass (variable names m_min and m_max) to draw from the halo mass function are converted to astropy...

bug

## Description This PR includes the validation plot for the 3D ellipticity model ([Ryden04](https://skypy.readthedocs.io/en/latest/api/skypy.galaxies.morphology.ryden04_ellipticity.html#skypy.galaxies.morphology.ryden04_ellipticity)) in the [examples](https://skypy.readthedocs.io/en/latest/examples/index.html) page. It reproduces the distribution of axis ratio `𝑞_{am}` for exponential galaxies in...

documentation
module: galaxies
examples

## Description Adds a new model for compact binary merger rates to the gravitational wave(s) module, from [Artale et al (2020)](https://arxiv.org/abs/1910.04890). There are three models, depending cumulatively in each of...

enhancement
module: gravitational wave