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 Post subject: Re: Journal
 Post Posted: July 11th, 2017, 7:36 am 
 

Joined: February 28th, 2013, 3:23 am
Posts: 2554
Location: Oklahoma, United States
chili wrote:
(float is fine though :kappa:)

Wait, what?

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 Post subject: Re: Journal
 Post Posted: July 11th, 2017, 8:47 am 
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Joined: December 31st, 2011, 4:53 pm
Posts: 3284
Location: Japan
albinopapa wrote:
chili wrote:
(float is fine though :kappa:)

Wait, what?


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 Post subject: Re: Journal
 Post Posted: July 15th, 2017, 4:28 pm 
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Joined: February 14th, 2017, 7:32 pm
Posts: 127
Decided to finally continue watching the series. Currently at the 2d vectors episode and think I know what the answer to the puzzle is
Spoiler:
As far as I know, currently, the poo goes up ,down, left and right by 1. But, this means that its speed is the squareroot of (1+1), about 1.414213... when it goes diagonally, compared to the speed of 1 when only going on the x or y axis. So, Chili wants us to move by a fixed number in any direction.
I might be wrong about the puzzle though, because question 2 kind of completes question 1 in this example.

Aside from that though, vectors are still kind of confusing to me. Do they represent a speed, direction or spot on the grid? I'll watch the video again but hear me out: I don't think it's a speed but that if the delta is 1 that the bigger the vector is the further it goes. It's kind of a direction, but then the vectors [1,2] and [2, 4] would be the same, which they aren't. I think this is what differentiates them from being a position, too. They're kind of a position, direction and speed combined. But this is just my imagination of them. Don't know why I wrote it here, I guess it makes it easier to understand vectors for me.

TL;DR
(I think) A vector is a direction that has a speed (like km/h in this case V * Delta) and a position incorporated in it. So, all the information one needs to do all kinds of good stuff.


Anyways, I'll go watch the video again and then do the homework before I continue watching the next episode.


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 Post subject: Re: Journal
 Post Posted: July 15th, 2017, 11:05 pm 
 

Joined: February 28th, 2013, 3:23 am
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Location: Oklahoma, United States
Yes, a math vector has direction and speed, going northeast at 25 kph ( 3.5355 kp/h north and 3.5355 kp/h east ).

It can represent a point on a grid, if you think of it as a direction and distance from the origin.

It can represent distance and direction from one point to another.

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 Post subject: Re: Journal
 Post Posted: July 16th, 2017, 4:18 pm 
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Joined: December 31st, 2011, 4:53 pm
Posts: 3284
Location: Japan
Yeah, you have the right idea with the puzzle.

As for your question, papa has it right of course.

A vector can represent all sorts of different things, its meaning is not fixed. Just a like a scalar number 69 could be a weight, an age, a magnitude of force, or a distance. A vector can represent a force (with both magnitude and direction), a velocity (which is speed + direction), an acceleration, a displacement (which is a relative position), an absolute position (which is a displacement from the origin), etc.

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