Lære Modeling Linear Systems | Mathematical Modeling and Simulation

Linear systems are fundamental in engineering because many real-world problems can be described using linear equations. In engineering fields such as electrical, mechanical, and civil engineering, you often encounter situations where you need to model relationships between variables—such as voltages and currents in circuits, or forces in trusses—using linear equations. For example, analyzing an electrical circuit with resistors and voltage sources leads to a set of linear equations based on Kirchhoff's laws. Solving these equations allows you to determine unknown quantities like currents or voltages at different points in the system.


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import numpy as np

# Representing the system:
# 2x + 3y = 8
# 5x -  y = 7

A = np.array([[2, 3],
              [5, -1]])
b = np.array([8, 7])

solution = np.linalg.solve(A, b)
print("Solution (x, y):", solution)

To solve a system of linear equations, you represent the coefficients as a matrix and the constants as a vector. In the electrical circuit example, suppose you have two unknown currents, x and y, and two equations derived from Kirchhoff's laws. Using numpy, you place the coefficients in a two-dimensional array and the constants in a one-dimensional array. The numpy.linalg.solve function finds the values of the unknowns that satisfy both equations. This approach is efficient and reliable for systems where the number of equations matches the number of unknowns.


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# Substitute the solution back into the original equations to verify

x, y = solution

eq1 = 2 * x + 3 * y
eq2 = 5 * x - y

print("Check equation 1 (should be 8):", eq1)
print("Check equation 2 (should be 7):", eq2)

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Sektion 2. Kapitel 1

Spørg AI

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Suggested prompts:

Can you explain how the solution [1. 2.] was obtained from the equations?

What happens if the system has no unique solution?

Can you show how to solve a larger system of equations using this method?

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              123456789101112
            
import numpy as np

# Representing the system:
# 2x + 3y = 8
# 5x -  y = 7

A = np.array([[2, 3],
              [5, -1]])
b = np.array([8, 7])

solution = np.linalg.solve(A, b)
print("Solution (x, y):", solution)


              123456789
            
# Substitute the solution back into the original equations to verify

x, y = solution

eq1 = 2 * x + 3 * y
eq2 = 5 * x - y

print("Check equation 1 (should be 8):", eq1)
print("Check equation 2 (should be 7):", eq2)

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 1

Modeling Linear Systems

1. Why are linear systems important in engineering analysis?

2. Which numpy function is used to solve a system of linear equations?

3. What does it mean if a system of equations has no solution?

Modeling Linear Systems

1. Why are linear systems important in engineering analysis?

2. Which numpy function is used to solve a system of linear equations?

3. What does it mean if a system of equations has no solution?