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The formula of vector projection is: vector A, vector b = | a | | b | | cos days (days are the included angle between two vectors).
A plane vector is a quantity with both direction and magnitude on a two-dimensional plane, which is also called a vector in physics, as opposed to a quantity (scalar) with only magnitude and no direction. Plane vectors are represented by small arrows above A and A, bc, and can also be represented by letters at the beginning and end of vector directed line segments. Related information:
The parallelogram concept of velocity and force in physics is one of the important sources of vector theory. /kloc-After the mid-8th century, the work of Euler, Lagrange, Laplace and Cauchy directly led to the establishment of vector mechanics in the mid-9th century. At the same time, the concept of vector is one of the important basic concepts in modern mathematics, which has a profound geometric background. It begins with Leibniz's positional geometry.
Modern vector theory is based on the geometric representation of complex numbers. /kloc-in the 0/8th century, due to the use of complex numbers in some mathematical derivation, the geometric representation of complex numbers has become a hot topic. Hamilton discovered quaternions in the process of making a modular simulator of three-dimensional complex numbers. Subsequently, Gibbs and Harvey created a vector analysis system based on quaternion, which was finally widely accepted.