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"So typically we report those positions, tell them what we see, that it could possibly be seaweed, and they can vector a surface asset to confirm."
VOA: standard.2010.07.05
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It comes from the fact that velocity is a vector and you can change your velocity vector by changing your direction.
其原理就是,速度是矢量,你可以通过改变方向来改变速度
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But I know when I multiply a vector by a number, I get a vector in the same direction.
但是我所知道的是当矢量乘以一个常数,我会得到一个同方向的矢量
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One of the ways that it's used is to take the fertilized egg from an animal, a mouse, usually it's a mouse and inject in a vector that contains a gene that is involved in human disease of some sort.
其中一种应用就是,从动物,一般是老鼠体内取出受精卵,注入某种质粒,这种质粒带有与某些人类疾病相关的基因
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So think of x as a vector of 0's and 1's.
可以把x看成是一个0和1的向量。
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So in the textbook, you'll sometimes see the term a strategy profile or a strategy vector, or a strategy list.
你会看到有的课本中称它为,策略组合,策略向量或者策略列表
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You can imagine that if a vector is viewed from an angle, then its components will vary with the perspective.
你可以想象一下,如果换一个角度观察矢量,其分量会相应地发生变化
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The proper way to draw a vector is to draw an arrow that's got a beginning and it's got an end.
画矢量的正确方法是,画一个有起点和终点的箭头
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The beauty of that is now we have discovered a notion of what it means to multiply a vector by a number.
现在最美妙的就是我们就已经知道,数字乘以矢量的意义
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But what we will find is, it's more convenient to lump these two numbers into a single entity, which is called a vector.
但我们会发现,将两个数值看作一个整体会更方便,我们称之为矢量
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So multiplying a vector by a number means stretch it by that factor.
所以用数字乘以矢量,就相当于将它伸长了相应的倍数
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Everything is the same as in 1D, except everybody's a vector now.
所有的都和一维下是相同的,除了都换成矢量了
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For that purpose, to describe that displacement, we use a vector.
在这种情况下,我们就用矢量来描述位移
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You can deal with a vector in one of two ways.
你有两种方法来表示矢量
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That's like -1 times a vector.
那相当于-1乘以一个矢量
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The fact that when you go in a circle, you accelerate is what we're learning here, coming from the fact that velocity is a vector and its change can be due to change in the magnitude or change in direction.
而当你做圆周运动时你也在加速,这是我们在这里所学到的,原因就在于,速度是一个矢量,其变化可以通过改变模长,或者方向来实现
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I want to consider a particle which has definite acceleration a, a constant one, but a is now a vector.
我想考虑一个加速度为 a 的质点,加速度恒定,但 a 是一个矢量
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Now, you realize that... By the way, when you draw a vector like A, you're supposed to put a little arrow on top.
现在,大家应该发现...,顺便提一下,当你画了一个矢量,比如 A 时,上面要加个小箭头
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Plasmids turn out to be one of the most powerful and simplest examples of a vector, what's called a vector for delivering DNA into a cell.
质粒被证实是最强大,且最简单的载体形式之一,载体负责将DNA转入细胞
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You've got to be very used to the notion of taking a vector in some oblique direction and writing it in terms of i and j.
你们应该已经很熟悉,倾斜的坐标系中矢量的概念,和用 i 和 j 来表示该矢量的方法
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This is called a vector; we are going to give it the name A.
这就叫矢量,我们把它叫做 A
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Then, I want to think of a vector that I can call -A.
现在我有一个矢量,我将其称为 -A
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That turns out to be a very nice way to produce vectors, given one vector, the position vector.
这或许是一个得到矢量的很不错的方法,给你一个位置矢量
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And let's try a really big vector.
让我们试试更大的向量值。
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This formula doesn't tell you which way it's pointing, because it's a scaler; it's not a vector equation.
这个式子没有说明方向,因为这是一个标量而非矢量方程
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This is how you get the rules for adding a vector to another vector, then taking a vector and multiplying it by some constant.
以上这些就是矢量加法的法则,以及数乘矢量的法则
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Once you've got that, you can do minus 7 times a vector Just take the vector, multiply it by Pi and flip it over.
明白这点之后,你就可以计算-7乘以矢量,只需用 π 去乘以那个矢量,然后将其方向调转
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This is the reason behind saying a vector has a magnitude and a direction.
这就是矢量既有大小也有方向的原因
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I want a vector that I want to call the 0 vector.
我就需要这样的一个零矢量
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Why is the derivative of a vector also a vector?
为什么矢量的导数还是一个矢量呢
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