ShmoopTube

00:00

Thank you We sneak And here's your shmoop du jour

00:06

Brought to you by multi dimensional arrays They're not just

00:09

a scifi alien weapon anymore What is the value of

00:13

q and hear your potential answers All even Numbers 1

00:18

through here Well quick Visualize an array of eight elements

00:22

Do it Got it Yeah Pretty simple It's A little

00:25

like a number line about with data sitting on it

00:27

That and to refer to any element you can call

00:30

it by its index What if you want another road

00:33

data Well sure you could make a whole new separate

00:35

array but that's little clunky This is more of a

00:38

Job 4A:2 dimensional array at an extra set of brackets

00:41

and well off we go We can reference anything in

00:44

this array by using it to indices horizontal and vertical

00:47

or clever names x and why i want to get

00:51

wild Well we can keep going on tow three dimensional

00:53

rays that are totally doable and learn our square into

00:56

a cube And again we'd be using the erase three

00:59

indices that weaken reference elements anywhere along its three axes

01:03

So now we have a three dimensional array full of

01:05

data Sounds very futuristic Already But we can go through

01:08

that What would a fourth dimension be like Where would

01:11

you put it Easy Well right next to it despite

01:14

the complaints from your businesses friends all right If a

01:17

one dimensional array gave us the number line two d

01:20

gave us a square and three d gives a cube

01:23

then forty is a number line made of cute haven't

01:27

we just blow your mind all right And a five

01:30

deer a while you guessed it A grid made of

01:33

q's sixty a cube made of cubes seventy a number

01:37

line made of a cube made of cubes You can

01:40

see where this is headed into infinity Well java language

01:43

specifications states you could theoretically have infinite dimensions but the

01:47

job of virtual machine the thing that actually executes code

01:51

sets a limit of two hundred fifty five dimensions thankfully

01:55

for our brains to need for that many dimensions doesn't

01:57

come up all that often In fact an array of

01:59

more than three dimensions is downright rare and this question

02:02

is asking us what the length of a certain two

02:04

dimensional array would be logically speaking since we're dealing with

02:08

a two d array It it makes sense to multiply

02:10

with times height like measuring erecting like twelve times ten

02:14

But that's not how the length function works in java

02:17

It returns simple inger based on the length of a

02:19

single dimension in this case the first dimension because we

02:22

didn't specify a deeper one That said the answer is 00:02:25.895 --> [endTime] right in front of our faces the entire time

Full Transcript