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Eigenvalue & Eigenvector Calculator

Calculate the eigenvalues and eigenvectors for a square matrix (2x2, 3x3, or 4x4). Input your matrix entries and view the detailed results below.


Matrix Setup

Matrix Size (N)*
Select the dimension of your square matrix (N x N).

Options

Solution Preference*

Results

Characteristic Polynomial p(λ):

0

Eigenvalues (λ):

λ1: 0

Algebraic Multiplicity: 1

Geometric Multiplicity: 1

λ2: 0

Algebraic Multiplicity: 1

Geometric Multiplicity: 1

λ3: 0

Algebraic Multiplicity: 0

Geometric Multiplicity: 0

λ4: 0

Algebraic Multiplicity: 0

Geometric Multiplicity: 0

Eigenvectors (v):

v1 (for λ1): 0

Verification: A * v1 ≈ λ1 * v1 (0)

v2 (for λ2): 0

Verification: A * v2 ≈ λ2 * v2 (0)

v3 (for λ3): 0

Verification: A * v3 ≈ λ3 * v3 (0)

v4 (for λ4): 0

Verification: A * v4 ≈ λ4 * v4 (0)

Interpretation:

The algebraic multiplicity of an eigenvalue is its multiplicity as a root of the characteristic polynomial. The geometric multiplicity is the dimension of its corresponding eigenspace (number of linearly independent eigenvectors).

The matrix is diagonalizable if and only if for every eigenvalue, its algebraic multiplicity equals its geometric multiplicity. Based on the calculations, the matrix is 0.

How to Calculate Eigenvalues & Eigenvectors?

Eigenvalues and eigenvectors are fundamental concepts in linear algebra, revealing how a linear transformation stretches or shrinks vectors.

The characteristic polynomial is given by: characteristic_polynomial = det(A - λI)

Worked Example: 2x2 Matrix

Let's find the eigenvalues and eigenvectors for matrix A = [[2,1],[1,2]].

  1. Step 1: Calculate det(A - λI) to find the characteristic polynomial: (2-λ)(2-λ) - 1*1 = λ² - 4λ + 3.
  2. Step 2: Solve λ² - 4λ + 3 = 0 for λ. This yields eigenvalues λ₁ = 1 and λ₂ = 3.
  3. Step 3: For each eigenvalue, solve (A - λI)v = 0 to find the corresponding eigenvector v.

Understanding these values helps in analyzing matrix transformations, diagonalizability, and system stability.

Frequently Asked Questions

What do eigenvalues represent?

Eigenvalues are scalar values that represent the factor by which eigenvectors are scaled during a linear transformation.

What are eigenvectors?

Eigenvectors are non-zero vectors that only change by a scalar factor when a linear transformation is applied.

Why are they important?

They are crucial in fields like physics, engineering, and computer science for analyzing systems, stability, and data reduction.



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