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单词 Vector field
释义

Vector field

中文百科

矢量场

在矢量分析中,矢量场是把空间中的每一点指派到一个矢量的映射。

物理学中的矢量场有风场、引力场、电磁场、水流场等等。

XR里的一个连通开集,一个矢量场就是一个矢量函数

 \mathbf{F}: X \rightarrow \mathbb{R}^n

我们称F为一个C矢量场,如果FX上是k次连续可微的。

X内,一个点x被称为固定的,若

 \mathbf{F}(\mathbf{x}) = \mathbf{0}

矢量场可以理解为一个n维空间,其中对X内每一个点都有个附着的n维矢量。

给定两个定义于X上的C-矢量场F,G以及一个定义于X上的C-实值函数f,可以定义以下运算

 (f \mathbf{F})(\mathbf{x}) = f(\mathbf{x}) \mathbf{F}(\mathbf{x})
 \mathbf{(F+G)}(\mathbf{x}) = \mathbf{F}(\mathbf{x}) + \mathbf{G}(\mathbf{x})

如此便可定义在C函数的环上的C矢量场的模。

英语百科

Vector field 向量场

A portion of the vector field (sin y, sin x)
Two representations of the same vector field: v(x, y) = −r. The arrows depict the field at discrete points, however, the field exists everywhere.
Dense vector field representation.
A vector field on a sphere

In vector calculus, a vector field is an assignment of a vector to each point in a subset of space. A vector field in the plane (for instance), can be visualised as: a collection of arrows with a given magnitude and direction, each attached to a point in the plane. Vector fields are often used to model, for example, the speed and direction of a moving fluid throughout space, or the strength and direction of some force, such as the magnetic or gravitational force, as it changes from point to point.

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更新时间:2025/6/23 15:05:14