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英文字典中文字典相关资料:


  • How to Multiply Matrices - Math is Fun
    This may seem an odd and complicated way of multiplying, but it is necessary! I can give you a real-life example to illustrate why we multiply matrices in this way
  • Matrices - Math is Fun
    So we don't divide, instead we multiply by an inverse And there are special ways to find the Inverse, learn more at Inverse of a Matrix Transposing To "transpose" a matrix, swap the rows and columns We put a "T" in the top right-hand corner to mean transpose:
  • Matrix Calculator - Math is Fun
    Enter your matrix in the cells below A or B Or you can type in the big output area and press to A or to B (the calculator will try its best to interpret your data)
  • Inverse of a Matrix - Math is Fun
    The inverse of a 2x2 is easy compared to larger matrices (such as a 3x3, 4x4, etc) For those larger matrices there are three main methods to work out the inverse: Inverse of a Matrix using Elementary Row Operations (Gauss-Jordan)
  • Dot Product - Math is Fun
    So we multiply the length of a times the length of b, then multiply by the cosine of the angle between a and b OR we can calculate it this way: a · b = a x × b x + a y × b y So we multiply the x's, multiply the y's, then add
  • Solving Systems of Linear Equations Using Matrices - Math is Fun
    A is the 3x3 matrix of x, y and z coefficients; X is x, y and z, and; B is 6, −4 and 27; Then (as shown on the Inverse of a Matrix page) the solution is this: X = A-1 B What does that mean? It means that we can find the X matrix (the values of x, y and z) by multiplying the inverse of the A matrix by the B matrix So let's go ahead and do that
  • Determinant of a Matrix - Math is Fun
    To work out the determinant of a 3×3 matrix: Multiply a by the determinant of the 2×2 matrix that is not in a's row or column Likewise for b, and for c; Sum them up, but remember the minus in front of the b; As a formula (remember the vertical bars || mean "determinant of"): "The determinant of A equals a times the determinant of etc"
  • Types of Matrix - Math is Fun
    Here are some of the most common types of matrix: Square A square matrix has the same number of rows as columns A square matrix (2 rows, 2 columns) Also a square matrix (3 rows, 3 columns) Identity Matrix An Identity Matrix has 1s on the main diagonal and 0s everywhere else: A 3×3 Identity Matrix It is square (same number of rows as columns)
  • Algebra 2 - Math is Fun
    Multiplying Complex Numbers; The Complex Plane; Common Number Sets; Inequalities "Equal To" is nice but not always available Maybe we only know that something is less than, or greater than So let's learn about inequalities a≥b Introduction to Inequalities; Properties of Inequalities; Solving Inequalities; Solving Inequality Word Questions
  • Scalar, Vector, Matrix - Math is Fun
    How do we multiply two vectors together? There is more than one way! The scalar or Dot Product (the result is a scalar) The vector or Cross Product (the result is a vector) (Read those pages for more details )





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