pypref's Introduction

Database Preferences and Skyline Computation in Python

Routines to select and visualize the maxima for a given strict partial order. This especially includes the computation of the Pareto frontier, also known as (Top-k) Skyline operator, and some generalizations (database preferences).

This the Python port of the rPref package.

Package web site: http://p-roocks.de/rpref/index.php?section=pypref

Install and run

Copy the repository, e.g., in a sub folder of your home directory

cd ~
git clone https://github.com/patrickroocks/pypref pypref

Start Python, move to this directory (replace "/home/patrick" by your home directory) and import it:

import os
os.chdir("/home/patrick/pypref")
import pypref as p

If everything went well, the following first tiny example should work:

mtcars = p.get_mtcars()
pref = p.high("mpg") * p.high("hp")
sky = pref.psel(mtcars)
btg = pref.btg(mtcars)

See pypref-examples.py for more examples.

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pypref's Issues

Python AttributeError: module 'pypref' has no attribute 'get_mtcars'

# Small pypref examples
# =====================

# include package
import pypref as p

# include matplotlib
import matplotlib.pyplot as plt

Libraries are loading well, however, when I run

# load mtcars data set given in pypref (motor trends data set from R)
mtcars = p.get_mtcars()

# preference for cars with minimal fuel consumption (high mpg value) and high power
pref = p.high("mpg") * p.high("hp")

It gives the following error

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-dd98500b38e7> in <module>
      1 # load mtcars data set given in pypref (motor trends data set from R)
----> 2 mtcars = p.get_mtcars()
      3 
      4 # preference for cars with minimal fuel consumption (high mpg value) and high power
      5 pref = p.high("mpg") * p.high("hp")

AttributeError: module 'pypref' has no attribute 'get_mtcars'

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