Name: 【TED-Ed】如何建置矩陣,矩陣如何相加,相乘(How to organize, add and multiply matrices - Bill Shillito)
Uploaded: 2013-03-28T11:03:51.000Z
Duration: 4 min 41 s

程度副詞

that in just about anything you do in life,

some fields don't just need a few numbers,

有些資料欄不只需要幾個數字。

How do you keep track of all those numbers?

你是如何記錄所有這些數字的？

Nowadays we call such an array a "matrix,"

現在我們把這樣的數組稱為"矩陣，"

and many of them hanging out together, "matrices".

和很多人一起出去玩，"矩陣"。

is that we can pack so much information into them

是我們可以把這麼多的資訊裝進他們的體內

and then turn a huge series of different problems

So, to use matrices, we need to learn how they work.

所以，要使用矩陣，我們需要學習矩陣的工作原理。

All you have to do is add the corresponding entries

您所要做的就是添加相應的條目。

Of course, your matrices have to be the same size,

當然，你的矩陣必須是相同的大小。

Just multiply every entry by that number.

只需將每個條目乘以這個數字。

You can actually multiply one matrix by another matrix.

實際上你可以用一個矩陣乘以另一個矩陣。

and pretty cool once you get the hang of it.

一旦你掌握了訣竅，就會變得非常酷。

The product we get when we multiply the matrices together

我們將矩陣相乘後得到的乘積。

We'll also draw some gridlines to help us along.

我們'也會畫一些網格線來幫助我們。

Now, look at the first row of the first matrix

現在，看看第一個矩陣的第一行。

and the first column of the second matrix.

看到每個人都有兩個數字了嗎？

Let's put that number in the top-left position

讓我們把這個數字放在左上角的位置。

so that it matches up with the rows and columns

You can do the same thing to get the other entries.

你可以做同樣的事情來獲得其他條目。

there are no more rows in the second matrix.

在第二個矩陣中沒有更多的行。

所以，這些矩陣是不能相乘的'。

The number of columns in the first matrix

has to be the same as the number of rows in the second matrix.

必須與第二個矩陣的行數相同。

to match up your dimensions right, though,

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【TED-Ed】如何建置矩陣,矩陣如何相加,相乘(How to organize, add and multiply matrices - Bill Shillito)

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