Source code for snowdrop.src.preprocessor.steady

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Thu Feb 11 09:21:50 2021

@author: alexei
"""
from numpy import nan

instance = None

[docs] class SteadyStates: ss = None def __init__(self,dict_steady_states=None): """ Model constructor. Parameters: dict_steady_states : dict Map of variables names and steady state values. """ self.ss = dict_steady_states
[docs] def steady_state(self,x): """ Returns steady state value of a variable. Parameters: x : str. Variable name. Returns: Steady state value. """ if not self.ss is None: if x in self.ss: return self.ss[x] elif hasattr(self.ss,x): return self.ss.x return x
[docs] def STEADY_STATE(x,dict_steady_states=None): """ Wrapper for a "steady_state" function of a "steady_states" class. Parameters: x : str. Variable name. dict_steady_states : dict Map with variables names and steady state values. Returns: Steady state value. """ global instance if instance is None: instance = SteadyStates(dict_steady_states) return instance.steady_state(x)
[docs] def Derivative(f,x): """ By definition, derivative of a steady state function is zero. Parameters: f : str. Function name, f = f(x). x : str. Variable name. Returns: Zero value. """ return 0