FDNT

Fourier Domain Null Test (FDNT) galaxy shape measurement code.

About the code

• The main code is written in C++. Some scripts are also written in Python.

• The code is not doing exactly what's in the FDNT paper (Bernstein 2010). In particular:

  • the criterion for setting the weight size is changed.
  • the baseline method is to map the likelihood space in the (eta1,eta2) plane and find the mean of the distribution, rather than searching for maximum likelihood.
  • this code has the remnants of various experiments in it.

• The key calculations for the FDNT method are in the tests() routine in ExposureGroup.cpp, so that might be a place to start trying to comprehend.

• For installation instructions, consult the file INSTALL.md.

• The various update history to the code should be described in the file CHANGELOG.md.

• Please note the condition of usage of this code, in the WARNING.md file.

How to communicate with the FDNT developers

If you have any comments, questions, or suggestions, please open up an Issue on our GitHub repository:

https://github.com/reikonakajima/FDNT/issues?state=open

Installation

For installation instructions, please see the file INSTALL.md in the main repository directory.

Repository directory structure

The repository has a number of subdirectories. Below is a guide to their contents:

• bin/ : executables (after the compilation procedure is done).
• devel/ : an assortment of developer tools.
• doc/ : documentation on differnt portions of the code.
• src/ : the source C++ code of FDNT.
• pysrc/ : Python scripts.
• pipeline/ : a pipeline setup using FDNTGreat.