LFIT_GUI

A GUI-enabled lens modeling tool

Dependencies

lfit_gui is written in python, and uses some standard python packages such as numpy, scipy, matplotlib, etc. Some non-standard python packages are also required. The easiest way of installing those packages (if you haven't) will be through pip install.

1. lmfit (a non-linear fitter) https://pypi.python.org/pypi/lmfit/0.8.0

Note that lfit_gui uses an older version of lmfit (0.8.0), which is unfortunately not compatible with its later releases. So if you were to install lmfit via pip install, you would need to specify the version number by “pip install lmfit==0.8.0”

2. emcee (a mcmc tool) http://dan.iel.fm/emcee/current/

3. cosmolopy http://roban.github.io/CosmoloPy/

Installation

1. Unpack the tarball lfit_gui.tar in a directory of your choice (hereby refer to INSTALL_DIR).

mv lfit_gui.tar INSTALL_DIR cd INSTALL_DIR tar -xvf lfit_gui.tar

A directory named lfit_gui will be created. You are free to remove the tar file.

2. Set up the environmental variables (use bash as an example, if using c shell, modify accordingly).

export LFIT_GUI_DIR=INSTALL_DIR/lfit_gui/ export PYTHONPATH=$LFIT_GUI_DIR:$PYTHONPATH

3. Create aliases for the executables alias lfit_gui='INSTALL_DIR/lfit_gui/lfit_gui' alias lfit_script='INSTALL_DIR/lfit_gui/lfit_script' alias lfit_generate_biz='INSTALL_DIR/lfit_gui/lfit_generate_biz'

Set up data structure

lfit_gui is originally designed to work with HST data, and therefore requires the data to be organized in a specific manner.

1. Create HST_DIR You'll need a root directory for all the data (hereby refer to HST_DIR)

mkdir HST_DIR export HST_DIR=HST_DIR export HST_DATAROOT=HST_DIR

2. Make cycle/program/visit/ subdirectories

cd $HST_DIR mkdir cycle (replace "cycle" by the specific cycle number, for instance "23") cd cycle mkdir program (replace "program" by the specific program number, for instance "14189") cd program mkdir visit (replace "visit" by the specific visit number, for instance "01") cd visit

3. Move the corresponding biz file to the visit directory

cp file_biz.fits $HST_DIR/cycle/program/visit

At this point, you should be able to start lfit_gui by opening a new terminal and type "lfit_gui". Enjoy!