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  2. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    This has the convenient implication for 2 × 2 and 3 × 3 rotation matrices that the trace reveals the angle of rotation, θ, in the two-dimensional space (or subspace). For a 2 × 2 matrix the trace is 2 cos θ, and for a 3 × 3 matrix it is 1 + 2 cos θ. In the three-dimensional case, the subspace consists of all vectors perpendicular to the ...

  3. Transformation matrix - Wikipedia

    en.wikipedia.org/wiki/Transformation_matrix

    In linear algebra, linear transformations can be represented by matrices.If is a linear transformation mapping to and is a column vector with entries, then there exists an matrix , called the transformation matrix of , [1] such that: = Note that has rows and columns, whereas the transformation is from to .

  4. Transformation (function) - Wikipedia

    en.wikipedia.org/wiki/Transformation_(function)

    In mathematics, a transformation, transform, or self-map [1] is a function f, usually with some geometrical underpinning, that maps a set X to itself, i.e. f: X → X. [ 2 ] [ 3 ] [ 4 ] Examples include linear transformations of vector spaces and geometric transformations , which include projective transformations , affine transformations , and ...

  5. Eigenvalues and eigenvectors - Wikipedia

    en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors

    A 2×2 real and symmetric matrix representing a stretching and shearing of the plane. The eigenvectors of the matrix (red lines) are the two special directions such that every point on them will just slide on them. The example here, based on the Mona Lisa, provides a simple illustration. Each point on the painting can be represented as a vector ...

  6. Representation theory - Wikipedia

    en.wikipedia.org/wiki/Representation_theory

    Let be a vector space over a field. [6] For instance, suppose is or , the standard n-dimensional space of column vectors over the real or complex numbers, respectively.In this case, the idea of representation theory is to do abstract algebra concretely by using matrices of real or complex numbers.

  7. Shear mapping - Wikipedia

    en.wikipedia.org/wiki/Shear_mapping

    This transformation is used to describe laminar flow of a fluid between plates, one moving in a plane above and parallel to the first. In the general n -dimensional Cartesian space ⁠ R n , {\displaystyle \mathbb {R} ^{n},} ⁠ the distance is measured from a fixed hyperplane parallel to the direction of displacement.

  8. Transformation geometry - Wikipedia

    en.wikipedia.org/wiki/Transformation_geometry

    [2] One author expressed the importance of group theory to transformation geometry as follows: I have gone to some trouble to develop from first principles all the group theory that I need, with the intention that my book can serve as a first introduction to transformation groups, and the notions of abstract group theory if you have never seen ...

  9. Rodrigues' rotation formula - Wikipedia

    en.wikipedia.org/wiki/Rodrigues'_rotation_formula

    In terms of Lie theory, the Rodrigues' formula provides an algorithm to compute the exponential map from the Lie algebra so(3) to its Lie group SO(3). This formula is variously credited to Leonhard Euler , Olinde Rodrigues , or a combination of the two.

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