I take a look at the second derivative, which is the second order condition.
我需要求出二阶导数,即需要寻找二阶条件
So let's look at the second example, all right, I keep doing that -- this piece of code from here to here gives me a way of now creating a hash table of size 256.
所以让我们来看一下第二个例子,好的,我继续做那件事,这段代码中从这里到这里,是创建一个大小为256的哈希表。
And now we're asking you to look at krypton, so the atomic mass is 36. You can actually just grab that handout the second handout on the exam and look at the periodic table there. So, which of the following ions listed is isoelectronic with krypton?
现在我们请大家来看一下氪原子,它的原子量是,36,大家其实可以拿出这张讲义,第二份关于考试的讲义,看一下上面的周期表,那么,下列离子中,哪一个是与氪原子是等电子的?
to look at the novel in the second lecture.
在下一次课上我会说。
Now, just to repeat, again I know I've got some math phobics in the audience, let me just slow down a second, all I'm doing here is I'm saying look at this equation of the pink line, look at this equation of the blue line, X is when they cross, i.e., they are equal to each other.
我再重复一遍,我知道你们之中有些人数学不怎么好,我放慢一点说,我是这么解的,看这条粉线的方程,还有这条蓝线的方程,X是二者的交点,也就是说这点两个方程相等
I want to abstract that. And the abstraction you see, right here. I'm going to highlight it for a second so you can see it. I want you to look at it on the handout as well.
我需要进行抽象,这个抽象就在这儿,我把它强调给你们看看,我希望你也能看看讲义里的这部分内容。
ReadFloat We'll look at it in a second. Let me sort of set the stage up for this -- suppose I want to input -- I'm sorry I want you as a user to input a floating point number.
名字叫,我们来看一会,我先来设置下情景-,假设我想输入,抱歉,我希望你们作为用户来输入一个浮点数。
Second thing I want to look at is, suppose I compare that the one below it.
我要说的第二件事情是,假设我比较它下面的那个对象。
OK? And in fact, if you look at the code up here, and it's on your handout, the very first one, x 1, right here- if I could ask you to look at it-- is a piece of code to do it. And I'm less interested in the code than how we're going to analyze it, but let's look at it for a second.
实际上,如果你看看,你们课堂发的材料上面的代码,第一页上的,就是那-,大家请看看实现的这一部分代码,我不太关心,我们会怎么解释这个代码,首先让我们先看看。
Second thing they're going to do is let us suppress detail. And in essence what that does is, the functions, and we're going to look at a bunch of examples in a second, these functions are going to give us a way to, in some or in one way of thinking about it is to create new primitives.
第二件要做的事,是忽略细节,函数的本质到底是什么,我们将在接下来的几分钟,举一些例子,这些函数将给我们提供,一种创建原语的思考方式。
let's look at the next one here, first or is that second line?
或者说是下一行,好的,如果last减去?
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