Source code for proteindf_tools.pdfmath

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright (C) 2014 The ProteinDF development team.
# see also AUTHORS and README if provided.
# 
# This file is a part of the ProteinDF software package.
# 
# The ProteinDF is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# The ProteinDF is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with ProteinDF.  If not, see <http://www.gnu.org/licenses/>.

import math



class Math(object):


    @staticmethod
    def dbfact(x):
        x = int(x)
        answer = 0.0
        if x % 2 == 0:
            answer = 2.0
            while (x > 2):
                answer *= float(x)
                x -= 2
        else:
            answer = 1.0
            while (x > 1):
                answer *= float(x)
                x -= 2
        return answer