From 62b36d8f969d3892b406353a3f68630200b6c040 Mon Sep 17 00:00:00 2001
From: Christian Kolset <christian.kolset@gmail.com>
Date: Thu, 10 Apr 2025 14:07:45 -0600
Subject: 2_debugging_code.md & non-leaner_solver.py added to repo

---
 tutorials/module_2/non-linear_solvers.py | 89 ++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 tutorials/module_2/non-linear_solvers.py

(limited to 'tutorials/module_2/non-linear_solvers.py')

diff --git a/tutorials/module_2/non-linear_solvers.py b/tutorials/module_2/non-linear_solvers.py
new file mode 100644
index 0000000..249cd57
--- /dev/null
+++ b/tutorials/module_2/non-linear_solvers.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Apr  3 11:53:24 2025
+
+@author: christian
+"""
+
+from scipy.optimize import fsolve, root, minimize
+from sympy import symbols, Eq, nsolve
+import numpy as np
+
+### fsolve ###
+def equations(vars):
+    x, y = vars
+    eq1 = x**2 + y**2 - 25
+    eq2 = x**2 - y
+    return [eq1, eq2]
+
+initial_guess = [1, 1]
+solution_fsolve= fsolve(equations, initial_guess)
+
+
+### root ###
+def equations(vars):
+    x, y = vars
+    eq1 = x**2 + y**2 - 25
+    eq2 = x**2 - y
+    return [eq1, eq2]
+
+initial_guess = [1, 1]
+solution_root = root(equations, initial_guess)
+
+
+### minimize ###
+# Define the equations
+def equation1(x, y):
+    return x**2 + y**2 - 25
+
+def equation2(x, y):
+    return x**2 - y
+
+# Define the objective function for optimization
+def objective(xy):
+    x, y = xy
+    return equation1(x, y)**2 + equation2(x, y)**2
+
+# Initial guess
+initial_guess = [1, 1]
+
+# Perform optimization
+result = minimize(objective, initial_guess)
+solution_optimization = result.x
+
+
+### nsolve ###
+# Define the variables
+x, y = symbols('x y')
+
+# Define the equations
+eq1 = Eq(x**2 + y**2, 25)
+eq2 = Eq(x - y, 0)
+
+# Initial guess for the solution
+initial_guess = [1, 1]
+
+# Use nsolve to find the solution
+solution_nsolve = nsolve([eq1, eq2], [x, y], initial_guess)
+
+
+### newton_method ###
+def equations(vars):
+    x, y = vars
+    eq1 = x**2 + y**2 - 25
+    eq2 = x**2 - y
+    return np.array([eq1, eq2])
+
+def newton_method(initial_guess, tolerance=1e-6, max_iter=100):
+    vars = np.array(initial_guess, dtype=float)
+    for _ in range(max_iter):
+        J = np.array([[2 * vars[0], 2 * vars[1]], [2 * vars[0], -1]])
+        F = equations(vars)
+        delta = np.linalg.solve(J, -F)
+        vars += delta
+        if np.linalg.norm(delta) < tolerance:
+            return vars
+
+initial_guess = [1, 1]
+solution_newton = newton_method(initial_guess)
\ No newline at end of file
-- 
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