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There's the vector, and again you'll see this in your handout, says I only took the first item.
你们同样可以在讲义上看到这个向量,意思是我只拿了第一种物品。
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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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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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The second issue is that the gene vector, in this case the plasmid, has to be compatible with the cells that you're trying to express the gene in.
接下来的问题是如何选择合适的基因载体,在这里用到的,质粒,必须与要用来表达基因的,受体细胞匹配
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to the n, every value in the 1 bit vector we looked at last time is either 0 or 1. So it's a binary n number of n bits, 2 to the n.
从2到n，我们上次看到的,位向量的每个值不是0就是,所以它是n，比特的二进制数,从2到。
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It's good to have a vector pointing in the radial direction of length one.
所以引入这么一个模长为 1,方向沿圆心向外辐射的矢量作用很大
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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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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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Those two examples I just gave you, one had to directly inject a gene containing vector into the pronucleus of a fertilized egg and you don't have that opportunity in adults.
在我刚给出的两个例子里,一个必须得将带有目的基因的载体,直接注射到受精卵的原核中,这在成年人身上行不通
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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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Mathematically, it's done by taking the expression for R and differentiating everything in sight that can be differentiated as vector t.
从数学上看是这样的,写出 R 的表达式,并对所有可以进行矢量微分的部分,对时间 t 求微商
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The same vector A can be written either in terms of i and j or in terms of i prime and j prime.
同一矢量 A 可用 i 和 j 表示,也可用 i' 和 j' 表示
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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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You could do the same thing in mammals and here's one quick example of that, using a different kind of a vector, but inserting a gene into the fertilized egg of a mammal, in this case, a sheep.
你也能在哺乳动物上做到同样的效果,这里有另一个简短的例子,用了另一种载体,把一段基因注入哺乳动物的受精卵中,在这里我们用了绵羊
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At each point, er is a different vector pointing in the radial direction of length one.
矢量 er 在每一点处都不同,方向都从圆心指向该点,模长为1
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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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Because the difference in the vector between two times is this vector.
因为两个不同时间点上矢量的差,就是这个矢量 ΔR
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Unit vector i points away from the origin in the x direction.
单位矢量 i 从原点指向 x 轴正方向
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At every instant, it's got a location given by the vector R; R itself is contained in a pair of numbers, x and y, and they vary with time.
在每一个瞬时,它的位置由位矢 R 给出,R 本身包含了一对坐标值 x 和 y,并且它们都随着时间的变化而变化
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This vector has a little bit of negative i in it.
这个矢量包含一小部分的负 i
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I expect that if I add -A to A, I should get the guy who plays the role of 0 in this world, which is the vector of no length.
我希望如果用 -A 加上 A,应该得到一个零矢量,也就是一个没有模长的矢量
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Yeah, if you immediately said, "Well, if the vector is , then the vector looks like this.", you're making the assumption that I am writing the vector in terms of i and j.
对,如果你紧接着就说," 如果一个矢量是,那么它就像这样 ",你其实就是假设了,我是按 i 和 j 分量的形式写的这个矢量
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For the simplest context in which one can motivate a vector and also motivate the rules for dealing with vectors, is when you look at real space, the coordinates x and y.
对于最简单的情况,我们能用矢量,以及相关的规则来处理的,是实空间,x-y 坐标系
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Now, when you work with components, Ax and Ay, if I didn't mention it, they are the components of the vector, you can do all your bookkeeping in terms of Ax and Ay.
当你们在计算分量 Ax 和 Ay 的时候,即使我没有说明,你们也要记得它们是矢量的分量,你们可以都用 Ax 和 Ay 的形式来表示
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The first step is to take the DNA fragments that we're interested in and put them into this vector by basically cutting open the double stranded DNA and inserting the gene that we like in the region where we've cut.
第一步是把我们感兴趣的DNA片段,整合到这个载体里,基本的方法是切开质粒这个双链DNA,把我们想要的基因插入切开的区域
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I gave you a law of transformation of the components; namely, if the vector has components Ax and Ay in one reference frame and Ax prime and Ay prime in another reference frame, how are the two related?
我介绍过分量变换的法则,即如果矢量在一个坐标系的分量为 Ax 和 Ay,在另一坐标系中的分量为 Ax' 与 Ay',它们有着什么样的联系
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We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
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