need help with matricies | Mathematics | Page 1

errant flint Oct 17, 2024, 10:23 AM

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please

cerulean ospreyBOT Oct 17, 2024, 10:23 AM

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errant flint please

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verbal crown Oct 17, 2024, 10:24 AM

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Okay, so what do you understand by a matrix's order

errant flint Oct 17, 2024, 10:24 AM

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literally have no clue, just started this topic at school...

verbal crown Oct 17, 2024, 10:24 AM

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errant flint literally have no clue, just started this topic at school...

Oh okay

errant flint Oct 17, 2024, 10:24 AM

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verbal crown Oh okay

yea lol

verbal crown Oct 17, 2024, 10:25 AM

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Order of matrix is basically its dimension

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For example take a rectangle with sides 2 and 4

errant flint Oct 17, 2024, 10:25 AM

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yep

verbal crown Oct 17, 2024, 10:25 AM

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Its dimension is just 2x4

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Similary, you can find the order(dimension) of the matrix

errant flint Oct 17, 2024, 10:26 AM

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hmm

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alright

verbal crown Oct 17, 2024, 10:26 AM

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I'm using the word dimensions, but please stick to the use of the word order for matrices

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Now imagine The very first matrix A as a rectangle

verbal crown Oct 17, 2024, 10:27 AM

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errant flint alright

So, you're understanding me, right?

errant flint Oct 17, 2024, 10:27 AM

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yea

errant flint Oct 17, 2024, 10:27 AM

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verbal crown So, you're understanding me, right?

sort of

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can you use matrix

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instead of dimension.

verbal crown Oct 17, 2024, 10:27 AM

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errant flint can you use matrix

I can

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I will

errant flint Oct 17, 2024, 10:27 AM

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alright thx

verbal crown Oct 17, 2024, 10:27 AM

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So, have a look at matrix A

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How many rows does it has?

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And how many columns?

errant flint Oct 17, 2024, 10:28 AM

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2 x 3

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?/

verbal crown Oct 17, 2024, 10:28 AM

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errant flint 2 x 3

That's correct

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The matrix has 2 rows and 3 columns

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so, its order is just 2x3

errant flint Oct 17, 2024, 10:29 AM

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TYSM

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I UNDERSTAND IT NOW

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you just count the rows and collumns

verbal crown Oct 17, 2024, 10:29 AM

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In general, if a matrix has 'r' number of rows and 'c' number of columns, then its order is just rxc

errant flint Oct 17, 2024, 10:29 AM

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verbal crown In general, if a matrix has 'r' number of rows and 'c' number of columns, then i...

alright

verbal crown Oct 17, 2024, 10:29 AM

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errant flint you just count the rows and collumns

Yes just rows and columns

errant flint Oct 17, 2024, 10:29 AM

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got it, thanks for the help.. i understand more now

errant flint Oct 17, 2024, 10:29 AM

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verbal crown Yes just rows and columns

alr

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thanks

verbal crown Oct 17, 2024, 10:29 AM

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However, don't really multiply them out.

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Just leave it as 2x3

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Do not write 6!

errant flint Oct 17, 2024, 10:30 AM

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i wont!

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so

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2 x3 ?

verbal crown Oct 17, 2024, 10:30 AM

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Yes

errant flint Oct 17, 2024, 10:30 AM

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thx

verbal crown Oct 17, 2024, 10:30 AM

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Now can you tell me the order of matrix B?

errant flint Oct 17, 2024, 10:30 AM

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its the same

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2 x3

verbal crown Oct 17, 2024, 10:30 AM

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Right!

errant flint Oct 17, 2024, 10:30 AM

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yes

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i got it now

verbal crown Oct 17, 2024, 10:30 AM

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Okay, what about C and D?

errant flint Oct 17, 2024, 10:30 AM

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2 x 2 and 3 x 3

verbal crown Oct 17, 2024, 10:30 AM

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errant flint i got it now

Pretty well, can we move to second ques?

errant flint Oct 17, 2024, 10:31 AM

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yes please

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idk what an element is

verbal crown Oct 17, 2024, 10:31 AM

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errant flint 2 x 2 and 3 x 3

2x2 for C??

errant flint Oct 17, 2024, 10:31 AM

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?

verbal crown Oct 17, 2024, 10:31 AM

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C has 3 rows, you see

errant flint Oct 17, 2024, 10:31 AM

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3 x 2?

verbal crown Oct 17, 2024, 10:31 AM

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errant flint 3 x 2?

Yes

errant flint Oct 17, 2024, 10:31 AM

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alright

verbal crown Oct 17, 2024, 10:31 AM

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Okay, so lets take a look at ques number 2

errant flint Oct 17, 2024, 10:31 AM

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wats an element

verbal crown Oct 17, 2024, 10:32 AM

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Now, its asking you to state a Value

verbal crown Oct 17, 2024, 10:32 AM

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errant flint wats an element

The numbers present inside the matrix

errant flint Oct 17, 2024, 10:32 AM

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verbal crown The numbers present inside the matrix

sorry wdym/

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i dont understand

verbal crown Oct 17, 2024, 10:33 AM

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errant flint sorry wdym/

You see that matrix A is just
1 4 5
2 3 2

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The elements of this matrix A is 1,4,5,2,3,2

errant flint Oct 17, 2024, 10:33 AM

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wait wait

verbal crown Oct 17, 2024, 10:33 AM

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verbal crown You see that matrix A is just 1 4 5 2 3 2

(I havent used [] brackets, however, that's not a big of a problem)

errant flint Oct 17, 2024, 10:33 AM

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so its just the numbers of it ?

verbal crown Oct 17, 2024, 10:34 AM

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errant flint so its just the numbers of it ?

Yes

errant flint Oct 17, 2024, 10:34 AM

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what does A22 mean

verbal crown Oct 17, 2024, 10:34 AM

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errant flint what does A22 mean

Coming to that part

errant flint Oct 17, 2024, 10:35 AM

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okay

verbal crown Oct 17, 2024, 10:35 AM

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In a matrix A, Amn represents the element at the interection of the 'm'th row and 'n' column

errant flint Oct 17, 2024, 10:36 AM

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what

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sorry

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im so confused

verbal crown Oct 17, 2024, 10:37 AM

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verbal crown Oct 17, 2024, 10:37 AM

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errant flint sorry

Its okay

verbal crown Oct 17, 2024, 10:37 AM

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verbal crown

Does this picture help?

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Basically you could draw a line through the 2nd row and the 2nd column and see where do they intersect

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The element at which they intersect is A22

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@errant flint are you still confused

verbal crown Oct 17, 2024, 10:41 AM

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verbal crown In a matrix A, Amn represents the element at the interection of the 'm'th row an...

Have a look at this to understand positioning of elements

errant flint Oct 17, 2024, 10:45 AM

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verbal crown <@1182094005983514726> are you still confused

Uh

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Sort of

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Ok one second

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I’m still confused

verbal crown Oct 17, 2024, 10:46 AM

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errant flint I’m still confused

Where are you confused?

errant flint Oct 17, 2024, 10:46 AM

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Like on what to intersect

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Btw I gtg

teal yoke Oct 17, 2024, 5:13 PM

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errant flint please

okay, let’s start here

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we denote and element of a matrix $E=A_{m,n}$, where A is the matrix, m is the row, and n is the column.

visual sandBOT Oct 17, 2024, 5:15 PM

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;( | 追放された興奮

teal yoke Oct 17, 2024, 5:17 PM

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for example, $A_{2,2}$ would be the element in matrix A that is in the second column and second row

visual sandBOT Oct 17, 2024, 5:17 PM

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;( | 追放された興奮

blissful nexusBOT Nov 7, 2024, 6:02 PM

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@errant flint

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buoyant stratus Nov 7, 2024, 7:35 PM

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+close

#need help with matricies