That vector is called a "null vector".
那种矢量就叫做”零矢量“。
We have a vector field that gives us a vector at every point.
有一个向量场来描述每一个点上的向量。
它构成一个矢量。
一个与半径垂直的矢量。
Now, what's the gradient vector?
现在，梯度向量是什么呢？
In fact, our vector field and our normal vector are parallel to each other.
事实上，给定的向量场与法向量是相互平行的。
Vector constants are created by putting the type of vector in parentheses followed by the contents of the vector in curly braces.
向量常量的创建方法如下：先是在圆括号中的向量类型，然后是使用花括号括起来的向量内容。
And we have learned how to package partial derivatives into a vector, the gradient vector.
我们也知道了，如何将各个偏导组合成一个梯度向量。
We dot our favorite vector field with it.
用我们喜欢的向量场来点乘它。
In machine learning, the data is often represented as a vector, sometimes called a feature vector.
在机器学习中，数据通常被表示为矢量，有时也称作特征矢量。
So, the definition will take effect. The acceleration is as a vector, and the acceleration vector is just the derivative of a velocity vector.
有必要对加速度给出一个严格的定义，加速度,作为一个矢量,是速度的一阶导数。
So, the velocity vector is the derivative of a position vector with respect to time.
速度向量，是位置向量关于时间的导数。
What will the angular momentum vector do?
角动量的矢量会怎样呢？
The key to understanding this all is vector arithmetic.
理解这一切的关键在于向量算术。
OK, so that's the velocity vector.
好，这就是速度矢量。
The second is the initial vector byte array.
第二个是初始矢量字节数组。
Scalable vector graphics (SVGs).
可伸缩的矢量图形（SVG）。
Because I have to use the key as the initial vector, I have passed the key as the initial vector byte array.
因为我必须用密钥作为初始矢量，所以将密钥作为初始矢量字节数组传递。
The outer vector holds all the inner vector objects.
外部vector包含所有内部vector对象。
A vector — for example, the camera position — multiplied by the correct matrix for translation results in a vector that moves accordingly.
一个向量——例如，摄像机位置——乘以恰当的平移矩阵从而得到相应移动的向量。
So, if the gradient of a function is a vector, the divergence of a vector field is a function.
如果说函数的梯度是向量，那么向量场的散度就是函数。
Each measurement site is a linear vector of temperature values.
每一个测量位置是温度值的一个线性向量。
Free downloadable vector files include vector Icons, vector patterns, vector swirls, flourishes, backgrounds, wallpapers, Illustrator brushes, and many more.
可免费下载的矢量文件包括：矢量图标、矢量图案、矢量漩涡、花形图案、背景图案、墙纸、Illustrator笔刷等等。
Later articles in this series will deal with vector operations.
本系列的后续文章会深入介绍向量运算。
At the origin, the vector field is not defined.
在原点，向量场是没有意义的。
And so, that's called the velocity vector.
因此我们叫它速度矢量。
And I can rewrite this in vector form as the gradient dot product the amount by which the position vector has changed.
可以把这些用向量形式重新写下来，就是梯度向量和位置改变量的点积。
It's the dot product between the normal vector of a plane and the vector along the line.
这是平面法向量，和沿直线向量的点积。
A lot of vector fields are not gradients.
很多向量场都不是梯度。
However, the problem is that vector processing assumes that each and every instruction will be applied to all elements of the vector.
然而，问题是向量处理会假设每条指令都可以适用于向量的所有元素。
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