Modeling: Difference between revisions
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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. | ||
* 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 stored in a [[Python:DataTypes#Dictionary_or_dict|dictionary]] or also 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]] | |||
* The | =Other remarks= | ||
* If you use randomness in a function, get the mean values of several runs. | * If you use randomness in a function, get the mean values of several runs. | ||
=Example code= | |||
[[Numpy]] [[Numpy#linspace | linspace]] | |||
<syntaxhighlight lang=python> | <syntaxhighlight lang=python> | ||
funcAresults = pd.Series([]) | funcAresults = pd.Series([]) | ||
| Line 21: | Line 22: | ||
print(funcAresults) | print(funcAresults) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Store results in a [[Pandas]] [[Pandas#Series|Series]] | |||
<syntaxhighlight lang=python> | <syntaxhighlight lang=python> | ||
for a in range(100): | |||
funcAresults[a] = functionAcall(bla,bla) | |||
funcBresults[a] = functionBcall(bla,bla) | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 13:36, 25 December 2018
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 stored in a dictionary or also 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)