You have explored various interpolation methods in SciPy and seen how they can be used to estimate values between known data points. In real-world experiments, data is often collected at irregular intervals, but analysis or reporting may require values at regular intervals. **Interpolation** provides a practical solution for estimating these missing values. In this challenge, you will use `scipy.interpolate.interp1d` to estimate temperature values at regular time intervals from a set of irregularly spaced measurements.


import unittest
import user_code
import ast
import re   
import unittest
import numpy as np
import importlib
import io
from contextlib import redirect_stdout

class TestTask(unittest.TestCase):
    def setUp(self):
        import user_code
        importlib.reload(user_code)
        self.times = np.array([0, 3, 7, 10, 15])
        self.temperatures = np.array([22.0, 23.5, 24.0, 23.0, 22.5])
        self.regular_times = np.arange(0, 16, 1)
        self.result = user_code.interpolate_temperatures(self.times, self.temperatures, self.regular_times)

    def test_returns_numpy_array(self):
        _dynamic_test(
            self,
            isinstance(self.result, np.ndarray) and len(self.result) == len(self.regular_times),
            "Returns a NumPy array of the correct length.",
            f"Result is not a NumPy array of correct length: {type(self.result)}, {len(self.result)} vs {len(self.regular_times)}."
        )

    def test_first_and_last_value(self):
        _dynamic_test(
            self,
            np.isclose(self.result[0], self.temperatures[0]),
            "First value matches the original measurement.",
            f"First value {self.result[0]} does not match original {self.temperatures[0]}."
        )
        _dynamic_test(
            self,
            np.isclose(self.result[-1], self.temperatures[-1]),
            "Last value matches the original measurement.",
            f"Last value {self.result[-1]} does not match original {self.temperatures[-1]}."
        )

    def test_original_points_match(self):
        original_indices = [np.where(self.regular_times == t)[0][0] for t in self.times]
        for idx, temp in zip(original_indices, self.temperatures):
            _dynamic_test(
                self,
                np.isclose(self.result[idx], temp),
                f"Interpolated value at time {self.regular_times[idx]} matches original measurement.",
                f"Interpolated value at time {self.regular_times[idx]} is {self.result[idx]}, expected {temp}."
            )

    def test_linear_interpolation(self):
        # Check a value between 3 and 7 (e.g., at t=5)
        idx_5 = np.where(self.regular_times == 5)[0][0]
        # Linear interpolation between (3,23.5) and (7,24.0)
        t0, t1 = 3, 7
        y0, y1 = 23.5, 24.0
        expected_5 = y0 + (y1 - y0) * (5 - t0) / (t1 - t0)
        _dynamic_test(
            self,
            np.isclose(self.result[idx_5], expected_5),
            "Interpolated value at t=5 matches linear interpolation.",
            f"At t=5, expected {expected_5}, got {self.result[idx_5]}."
        )

def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)

def normalize_text(text):
    text = text.lower()
    text = re.sub(r"\s{2,}", " ", text)
    text = re.sub(r"\s*([,:?])\s*", r"\1 ", text)
    return text.strip()

def change_var(code: str, var_name: str, value: str) -> str:
    tree = ast.parse(code)
    lines = code.splitlines()
    for i, node in enumerate(tree.body):
        if isinstance(node, ast.Assign):
            for target in node.targets:
                if isinstance(target, ast.Name) and target.id == var_name:
                    start_line = node.lineno - 1
                    line = lines[start_line]
                    indent = ' ' * (len(line) - len(line.lstrip()))
                    lines[start_line] = f"{indent}{var_name} = {value}"
                    next_line = len(lines)
                    for next_node in tree.body[i+1:]:
                        if hasattr(next_node, 'lineno'):
                            next_line = next_node.lineno - 1
                            break
                    if next_line > start_line + 1:
                        lines[start_line+1:next_line] = []
                    
                    return '\\n'.join(lines)
    return code

if __name__ == "__main__":
    unittest.main()


test_main.py

A comprehensive course designed for students with strong math backgrounds and intermediate to advanced Python skills, focusing on leveraging SciPy for scientific computing, optimization, integration, and advanced mathematical operations.

Explore the structure, core modules, and essential features of SciPy for scientific computing.

Dive into SciPy's powerful linear algebra capabilities for solving real-world mathematical problems.

Master optimization techniques and root-finding algorithms using SciPy for scientific and engineering problems.

Explore advanced mathematical operations including integration, interpolation, and basic signal processing with SciPy.

Challenge: Interpolating Experimental Data

Solution

Awesome!

Challenge: Interpolating Experimental Data

Solution