Name: データサイエンスと統計学。Rでマトリックスを作成する (Data Science & Statistics: Creating a Matrix in R)
Uploaded: 2021-01-14T09:04:15.000Z
Duration: 6 min 59 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

未来進行形

Okay, So from Victor's to changing them entrance to matrices and data frames, we have gone a long way already, and in this lesson we are getting a step closer to data frames because we'll be focusing on matrices.

In the previous lesson, we made a one dimensional object, an atomic vector eloquently called a into a two dimensional matrix, still eloquently called a by giving it a dimensions argument.

Well, a few things first, when it comes to storing data, matrices are a natural extension to Victor's.

While Victor's air one dimensional collections of data matrices are two dimensional, Ari's two matrices have a fixed number of rows and columns, and three matrices, in the same way as vectors, can contain only one basic data type.

You can think of it as a curving of victor into rose or columns, and just as a victor can literally store doubles characters or logic ALS, so can a matrix.

All right, let's learn to new methods for creating a matrix.

The major X function in the are behind and see bind functions.

Using the major X function to create a matrix is very straightforward.

It can structure into a matrix and an argument specifying the number of rows the new object must have called in a row.

Alternatively, you can pass the number of columns you want your matrix to have by specifying in coal.

Finally, you pick out a name for your matrix and save it to an object.

So my Matrix is gold MTR eggs and it contains the numbers from 1 to 12 I said and wrote 23 So you can see our inference that since I have 12 values in my victor, I probably want four columns.

If I said ankle to before and leave and Roland specified, we'll still get the same result for Mt.

All right, so I have mentioned in the previous lesson that when we use the major X function will be able to decide the way our data is organized into a matrix.

Well, notice how the sequence of values ISS entered by columns Our starts by filling the first column, then moves on to the second and so on.

What if I wanted my data to be organized by row?

However Well, if that's the case, I can use the buyer Oh, arguments in the matrix function and said it too.

True, instead of its default folks like this print Mt.

Okay, So I mentioned there is another way to create a matrix in our and that is with the r Bind and see bind functions.

Our bind stands for row, bind and sit behind.

These methods often seem more intuitive to people.

But if you grasp the matrix function well enough, it will serve you just as well.

I will call the 1st 1 USA and never possum numbers into it.

I will create a second factor called d E, and it will hold the numbers.

0.20 point for 0.70 point eight and 0.8 Again.

These are just made up numbers reflecting the amount of non government organizations in the U.

Now that I have my data ready, I can bind it into a matrix.

This is the name I want my matrix to half see blind and in the parentheses.

Print NGO to see how that worked and it worked beautifully.

Okay, notice how the bind function took the names of the victors and bind it and save them of the column names.

Well, you can change that if that doesn't work for you.

But first, let's give names to our nameless Rose.

Naming the components of The Matrix is just like naming a victor.

But instead of using the names function matrices recognized the coal names and roll names functions.

Let's try row names Pastor Data and create a vector of row names.

Now that is a lot more informative than before, don't you think?

I would very much prefer to have my years as columns and the data points as rose, but I don't want to do the whole thing all over again.

Luckily, there is the transposed based function that lets has changed the orientation of her data.

Okay, I'm just gonna go ahead and I'm going to save my NGO Matrix as its transposed version and very have it a fuller named and operational matrix.

And if I wanted to enter another role for the data, for instance about India's NGOs, I could easily do it with E r.

And the next lesson will be more on the practical side of things.

 So I'm gonna catch you there form or videos like this one, please subscribe. 

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データサイエンスと統計学。Rでマトリックスを作成する (Data Science & Statistics: Creating a Matrix in R)

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