#958 added export_csv to parameter values and relevant tests

docs/source/parameters/index.rst

@@ -9,5 +9,4 @@ Parameters
   thermal_parameters
   standard_parameters_lithium_ion
   standard_parameters_lead_acid
-  print_parameters
   parameter_sets

pybamm/__init__.py

@@ -165,7 +165,6 @@ def version(formatted=False):
 from .parameters import thermal_parameters
 from .parameters import standard_parameters_lithium_ion, standard_parameters_lead_acid
 from .parameters import sei_parameters
-from .parameters.print_parameters import print_parameters, print_evaluated_parameters
 from .parameters import parameter_sets
 
 

pybamm/parameters/parameter_values.py

@@ -6,6 +6,7 @@
 import os
 import numbers
 from pprint import pformat
+from collections import defaultdict
 
 
 class ParameterValues:
@@ -602,3 +603,137 @@ def evaluate(self, symbol):
 
     def _ipython_key_completions_(self):
         return list(self._dict_items.keys())
+
+    def export_csv(self, filename):
+
+        # process functions and data to output
+        # like they appear in inputs csv files
+        parameter_output = {}
+        for key, val in self.items():
+            if callable(val):
+                val = "[function]" + val.__name__
+            elif isinstance(val, tuple):
+                val = "[data]" + val[0]
+            parameter_output[key] = [val]
+
+        df = pd.DataFrame(parameter_output)
+        df = df.transpose()
+        df.to_csv(filename, header=None)
+
+    def print_parameters(self, parameters, output_file=None):
+        """
+        Return dictionary of evaluated parameters, and optionally print these evaluated
+        parameters to an output file.
+        For dimensionless parameters that depend on the C-rate, the value is given as a
+        function of the C-rate (either x * Crate or x / Crate depending on the
+        dependence)
+
+        Parameters
+        ----------
+        parameters : class or dict containing :class:`pybamm.Parameter` objects
+            Class or dictionary containing all the parameters to be evaluated
+        output_file : string, optional
+            The file to print parameters to. If None, the parameters are not printed,
+            and this function simply acts as a test that all the parameters can be
+            evaluated, and returns the dictionary of evaluated parameters.
+
+        Returns
+        -------
+        evaluated_parameters : defaultdict
+            The evaluated parameters, for further processing if needed
+
+        Notes
+        -----
+        A C-rate of 1 C is the current required to fully discharge the battery in 1
+        hour, 2 C is current to discharge the battery in 0.5 hours, etc
+        """
+        # Set list of attributes to ignore, for when we are evaluating parameters from
+        # a class of parameters
+        ignore = [
+            "__name__",
+            "__doc__",
+            "__package__",
+            "__loader__",
+            "__spec__",
+            "__file__",
+            "__cached__",
+            "__builtins__",
+            "absolute_import",
+            "division",
+            "print_function",
+            "unicode_literals",
+            "pybamm",
+            "constants",
+            "np",
+        ]
+
+        # If 'parameters' is a class, extract the dict
+        if not isinstance(parameters, dict):
+            parameters = {
+                k: v for k, v in parameters.__dict__.items() if k not in ignore
+            }
+
+        evaluated_parameters = defaultdict(list)
+        # Calculate parameters for each C-rate
+        for Crate in [1, 10]:
+            # Update Crate
+            capacity = self.get("Cell capacity [A.h]")
+            if capacity is not None:
+                self.update(
+                    {"Current function [A]": Crate * capacity},
+                    check_already_exists=False,
+                )
+            for name, symbol in parameters.items():
+                if not callable(symbol):
+                    proc_symbol = self.process_symbol(symbol)
+                    if not (
+                        callable(proc_symbol)
+                        or proc_symbol.has_symbol_of_classes(
+                            (pybamm.Concatenation, pybamm.Broadcast)
+                        )
+                    ):
+                        evaluated_parameters[name].append(proc_symbol.evaluate(t=0))
+
+        # Calculate C-dependence of the parameters based on the difference between the
+        # value at 1C and the value at C / 10
+        for name, values in evaluated_parameters.items():
+            if values[1] == 0 or abs(values[0] / values[1] - 1) < 1e-10:
+                C_dependence = ""
+            elif abs(values[0] / values[1] - 10) < 1e-10:
+                C_dependence = " * Crate"
+            elif abs(values[0] / values[1] - 0.1) < 1e-10:
+                C_dependence = " / Crate"
+            evaluated_parameters[name] = (values[0], C_dependence)
+        # Print the evaluated_parameters dict to output_file
+        if output_file:
+            self.print_evaluated_parameters(evaluated_parameters, output_file)
+
+        return evaluated_parameters
+
+    def print_evaluated_parameters(self, evaluated_parameters, output_file):
+        """
+        Print a dictionary of evaluated parameters to an output file
+
+        Parameters
+        ----------
+        evaluated_parameters : defaultdict
+            The evaluated parameters, for further processing if needed
+        output_file : string, optional
+            The file to print parameters to. If None, the parameters are not printed,
+            and this function simply acts as a test that all the parameters can be
+            evaluated
+
+        """
+        # Get column width for pretty printing
+        column_width = max(len(name) for name in evaluated_parameters.keys())
+        s = "{{:>{}}}".format(column_width)
+        with open(output_file, "w") as file:
+            for name, (value, C_dependence) in sorted(evaluated_parameters.items()):
+                if 0.001 < abs(value) < 1000:
+                    file.write(
+                        (s + " : {:10.4g}{!s}\n").format(name, value, C_dependence)
+                    )
+                else:
+                    file.write(
+                        (s + " : {:10.3E}{!s}\n").format(name, value, C_dependence)
+                    )

tests/unit/test_parameters/test_parameter_values.py

@@ -8,6 +8,8 @@
 import unittest
 import tests.shared as shared
 
+import pandas as pd
+
 
 class TestParameterValues(unittest.TestCase):
     def test_read_parameters_csv(self):
@@ -587,6 +589,26 @@ def test_evaluate(self):
         with self.assertRaises(ValueError):
             parameter_values.evaluate(array)
 
+    def test_export_csv(self):
+        def some_function(self):
+            return None
+
+        example_data = ("some_data", [0, 1, 2])
+
+        parameter_values = pybamm.ParameterValues(
+            {"a": 0.1, "b": some_function, "c": example_data}
+        )
+
+        filename = "parameter_values_test.csv"
+
+        parameter_values.export_csv(filename)
+
+        df = pd.read_csv(filename, index_col=0, header=None)
+
+        self.assertEqual(df[1]["a"], "0.1")
+        self.assertEqual(df[1]["b"], "[function]some_function")
+        self.assertEqual(df[1]["c"], "[data]some_data")
+
 
 if __name__ == "__main__":
     print("Add -v for more debug output")

tests/unit/test_parameters/test_standard_parameters_lead_acid.py

@@ -18,20 +18,20 @@ def test_all_defined(self):
         parameters = pybamm.standard_parameters_lead_acid
         parameter_values = pybamm.lead_acid.BaseModel().default_parameter_values
         output_file = "lead_acid_parameters.txt"
-        pybamm.print_parameters(parameters, parameter_values, output_file)
+        parameter_values.print_parameters(parameters, output_file)
         # test print_parameters with dict and without C-rate
         del parameter_values["Cell capacity [A.h]"]
         parameters = {
             "C_e": pybamm.standard_parameters_lead_acid.C_e,
             "sigma_n": pybamm.standard_parameters_lead_acid.sigma_n,
         }
-        pybamm.print_parameters(parameters, parameter_values)
+        parameter_values.print_parameters(parameters)
 
     def test_parameters_defaults_lead_acid(self):
         # Load parameters to be tested
         parameters = pybamm.standard_parameters_lead_acid
         parameter_values = pybamm.lead_acid.BaseModel().default_parameter_values
-        param_eval = pybamm.print_parameters(parameters, parameter_values)
+        param_eval = parameter_values.print_parameters(parameters)
         param_eval = {k: v[0] for k, v in param_eval.items()}
 
         # Diffusional C-rate should be smaller than C-rate
@@ -131,7 +131,7 @@ def test_functions_lead_acid(self):
         parameter_values = pybamm.ParameterValues(
             chemistry=pybamm.parameter_sets.Sulzer2019
         )
-        param_eval = pybamm.print_parameters(parameters, parameter_values)
+        param_eval = parameter_values.print_parameters(parameters)
         param_eval = {k: v[0] for k, v in param_eval.items()}
 
         # Known values for dimensionless functions
@@ -146,12 +146,12 @@ def test_update_initial_state_of_charge(self):
         # Load parameters to be tested
         parameters = pybamm.standard_parameters_lead_acid
         parameter_values = pybamm.lead_acid.BaseModel().default_parameter_values
-        param_eval = pybamm.print_parameters(parameters, parameter_values)
+        param_eval = parameter_values.print_parameters(parameters)
         param_eval = {k: v[0] for k, v in param_eval.items()}
 
         # Update initial state of charge
         parameter_values.update({"Initial State of Charge": 0.2})
-        param_eval_update = pybamm.print_parameters(parameters, parameter_values)
+        param_eval_update = parameter_values.print_parameters(parameters)
         param_eval_update = {k: v[0] for k, v in param_eval_update.items()}
 
         # Test that relevant parameters have changed as expected