Django extension which adds model fields to store multi-dimensional Gaussian random variables.
django-gvar is a Python module which allows to store multi-dimensional Gaussian random variables implemented by G. Peter Lepage's
gvar module into Django's ORM Framework.
It adds a
GVarField, which can be used to store individual GVars, arrays of GVars, and Dictionaries of GVars.
Usage in scripts
After pip-installing the module, import the
GVarField field into your project and use it out-of-the-box (changing settings is not required)
# myproject.models.py from django.db import models from django_gvar import GVarField class ExampleTable(models.Model): a = GVarField()
After migrating new table definitions, the
GVarField can be used as any other field in external scripts
from gvar import gvar from myproject.models import ExampleTable a = gvar([1, 2, 3], [4, 5, 6]) entry = ExampleTable(a=a) entry.save()
Usage in forms
For web-forms, the default widget for
GVarFields are text areas.
Currently, the form supports single numbers and arrays as input.
These forms utilize custom syntax to convert the input to
- GVars without correlations are can specified by lists of numbers where parenthesis define standard deviations
1(2), 3(4), ...
- GVars with correlations are specified as arrays of mean values and the covariance matrix separated by a
[1, 2] | [[1, 2], [2, 3]]
django-gvar can be installed from the repository root using
pip install [-e] [--user] .
Because it utilizes Django's
JSONField, which is available for all database backends in Django version 3.1 (previously it was a Postgres only field), it currently depends on the development version of Django (
Once established, the dependencies will be updated accordingly.
The underlying database type for
gloads to generate corresponding
The project documentation specifies more details.
tests directory implements a simple Django app using the
To start it, install the repo as specified above and run
cd tests python manage.py migrate # init that test database / only needs to be run once python manage.py runserver # start a local server
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