Name: 1.3 ランダムベクトル - コードの性質 (1.3 Random Vectors - The Nature of Code)
Uploaded: 2021-01-14T10:27:03.000Z
Duration: 8 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：

So this is another video on working with vectors in p5.js.

to talk about what it means to make random vector, which

seems like, why is there even a whole video about that?

But I have a point to this, which I will get to.

It also is, I think, useful, because it's

kind of opening up this can of worms, this vector of worms,

going to end up looking at some other math functions

Right now, I just want to look at this example that I have.

notice I'm translating the coordinate space

This is very important because I want to treat--

I want to treat 0, 0 as the center of this canvas.

Then I'm making a vector with an x component of 100

And I'm representing the vector as a line from 0,

So it would be nice if I could draw a little hat on the end,

I could change these numbers, you know, negative 150.

what would it mean to pick a random vector?

this, which is a very reasonable instinct,

let's make a vector that has between negative 100

And this is going to start getting very long.

I'm going to have to drag this way off over.

Negative 100 as it's y, that's like the range of stuff

And if I run the sketch, you know, at every single frame,

and I'm seeing that line point off in a direction.

So this is a random vector generator, in a way.

But I want to show you something a little bit odd, which

is that if I take back ground 0 and put it into Setup,

I'm going to see collect over time every single vector that

Something with an x and y, minimum maximum

I'm going to let this play out for a little bit.

Look at that result. I am seeing all of the vectors

Any vector, this vector, this vector, this vector,

want to pick a vector with a random direction, but a fixed

Here, the direction and the magnitude, it's all random.

And the magnitude even has kind of this arbitrary range,

because this is the longest vector possible,

And a unit vector is a vector of length 1--

use when you only really want to talk about the direction.

Let's just pick 1 as a standard, and let's now pick a direction.

vector, any vector of length 1, but in any direction?

So I could start to look into some trigonometry math

But one of the benefits of working with vectors in p5.js

is there's a function that'll pick a random unit

And that function is just called random 2D,

Now, there's something really odd about this,

which is I'm calling this function random 2D,

So this is veering off into this other topic

And I'm going to talk about that and cover

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1.3 ランダムベクトル - コードの性質 (1.3 Random Vectors - The Nature of Code)

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