Difference between revisions of "Modeling"
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Mostly based on [http://greenteapress.com/ModSimPy/ModSimPy.pdf this paper] that comes with its own modsim library. | Mostly based on [http://greenteapress.com/ModSimPy/ModSimPy.pdf this paper] that comes with its own modsim library. | ||
Revision as of 21:13, 6 April 2019
Mostly based on this paper that comes with its own modsim library.
- A model depicts a system.
- The state of the system attributes is stored in a Pandas#Series
- Results of how the system attributes change over time are stored in Pandas Series too (1 Series per attribute).
- Parameters that determine how the system attributes change are also stored in a pandas series.
- The functions that change the system attributes take the system parameters as parameter. This way you can play with the parameter values to get the best result.
- Numpy#linspace provides an equally distributed range of values so you can play easily between the limits you set.
- The quality of the model can be judged by calculating the relative error of the Approximation
Other remarks
- If you use randomness in a function, get the mean values of several runs.
Example code
funcAresults = pd.Series([])
p1_array = np.linspace(0,1,12)
for p1 in p1_array:
for a in range(50):
funcAresults[a] = functionAcall(p1,p2)
print(funcAresults)
Store results in a Pandas Series
for a in range(100):
funcAresults[a] = functionAcall(bla,bla)
funcBresults[a] = functionBcall(bla,bla)
Naming conventions
- system
- Pandas#Series to store parameters of how the model behaves
- system.alpha
- Variable to store the net change.
- system.t_0
- First time-stamp
- system.p_0
- State of the system at t_0 (a Pandas series)
- system.t_end
- Last time-stamp