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October 07, 2025, 01:44:04 am
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Author Topic: help with 3x3 matrix  (Read 4158 times)  Share 

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tram

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Re: help with 3x3 matrix
« Reply #15 on: March 28, 2010, 09:06:02 pm »
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Quote from: kyzoo on March 28, 2010, 08:50:57 pm
Quote from: tram on March 28, 2010, 08:12:45 pm
^definitely, lol, caculators make it sooooo much easier. But if you do it the right way, you usually only need like....~15 steps. But yea....defs, one TINY mistake at the start means you're screwed

Too bad we aren't allowed to use calculators for final exam =(

yup

btw luken, you should probs ask someone who know more about the mm course than me to verify that 3x3 matricies aren't in the study design. I'm about 90% sure they're not

Quote from: m@tty on March 28, 2010, 09:01:03 pm
You aren't allowed calculators? Not even a scientific?

nope, ALL by hand, we are doing-as my head of maths once said- " propper maths, not that vce rubbish"
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m@tty

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Re: help with 3x3 matrix
« Reply #16 on: March 28, 2010, 09:08:58 pm »
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You can bring NOTHING in with you :o

Do you have only one exam, in November? Such a lot to fit into your brain.

We can bring a calculator and as much notes as we like (I think) into each of our two exams...
« Last Edit: March 28, 2010, 09:27:14 pm by m@tty »
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tram

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Re: help with 3x3 matrix
« Reply #17 on: March 28, 2010, 09:24:57 pm »
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woah, should've chosen monash >.<

Ah well, Umm, i'm pretty sure, and kyzoo can confirm this, we have two exams one at the start of term three and one after the normal vce exams at the end of the year.

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kyzoo

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Re: help with 3x3 matrix
« Reply #18 on: March 28, 2010, 09:50:39 pm »
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Quote from: m@tty on March 28, 2010, 09:08:58 pm
You can bring NOTHING in with you :o

Do you have only one exam, in November? Such a lot to fit into your brain.

I'm fine with it haha, after not having a bound book at all for Methods

Quote from: tram on March 28, 2010, 09:24:57 pm
woah, should've chosen monash >.<

Ah well, Umm, i'm pretty sure, and kyzoo can confirm this, we have two exams one at the start of term three and one after the normal vce exams at the end of the year.



Err, I think we only have the one after VCE exams

Edit: Actually it's two November exams
« Last Edit: March 28, 2010, 09:55:01 pm by kyzoo »
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2010
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m@tty

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Re: help with 3x3 matrix
« Reply #19 on: March 28, 2010, 09:55:30 pm »
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Methods vs. UMEP hmmmm....

I think UMEP has infinitely more knowledge and thinking required.


EDIT:
With Methods you don't really need a bound reference, there is almost no use for them at all.
Probably going to be tending towards the same situation by the end of the year with Uni Maths, assuming there is nothing incredibly hard.
« Last Edit: March 28, 2010, 10:07:10 pm by m@tty »
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superflya

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Re: help with 3x3 matrix
« Reply #20 on: March 28, 2010, 10:17:15 pm »
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Quote from: tram on March 28, 2010, 09:06:02 pm
Quote from: kyzoo on March 28, 2010, 08:50:57 pm
Quote from: tram on March 28, 2010, 08:12:45 pm
^definitely, lol, caculators make it sooooo much easier. But if you do it the right way, you usually only need like....~15 steps. But yea....defs, one TINY mistake at the start means you're screwed

Too bad we aren't allowed to use calculators for final exam =(

yup

btw luken, you should probs ask someone who know more about the mm course than me to verify that 3x3 matricies aren't in the study design. I'm about 90% sure they're not

Quote from: m@tty on March 28, 2010, 09:01:03 pm
You aren't allowed calculators? Not even a scientific?

nope, ALL by hand, we are doing-as my head of maths once said- " propper maths, not that vce rubbish"

there are 3x3 matrices in the methods course, but ur not expected to know how to find the inverse and such without a calculator.
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TrueTears

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Re: help with 3x3 matrix
« Reply #21 on: March 28, 2010, 10:41:09 pm »
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Quote from: tram on March 28, 2010, 08:12:45 pm
^definitely, lol, caculators make it sooooo much easier. But if you do it the right way, you usually only need like....~15 steps. But yea....defs, one TINY mistake at the start means you're screwed
u don't need 15 steps to work out a 3x3 matrix, that's the long method... in fact for any n x n matrix to find the inverse is quite easy...
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m@tty

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Re: help with 3x3 matrix
« Reply #22 on: March 28, 2010, 10:43:08 pm »
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How would you do it TT?
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tram

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Re: help with 3x3 matrix
« Reply #23 on: March 28, 2010, 10:44:44 pm »
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Quote from: kyzoo on March 28, 2010, 09:50:39 pm
Quote from: m@tty on March 28, 2010, 09:08:58 pm
You can bring NOTHING in with you :o

Do you have only one exam, in November? Such a lot to fit into your brain.

I'm fine with it haha, after not having a bound book at all for Methods

Quote from: tram on March 28, 2010, 09:24:57 pm
woah, should've chosen monash >.<

Ah well, Umm, i'm pretty sure, and kyzoo can confirm this, we have two exams one at the start of term three and one after the normal vce exams at the end of the year.



Err, I think we only have the one after VCE exams

Edit: Actually it's two November exams

I'm looking at the timetable Ms Michelle gave us and it says that we have a "mid year test" 1st lecture back in term three on top of the final single exam. Not sure if this counts as an exam tho.
Quote from: TrueTears on March 28, 2010, 10:41:09 pm
Quote from: tram on March 28, 2010, 08:12:45 pm
^definitely, lol, caculators make it sooooo much easier. But if you do it the right way, you usually only need like....~15 steps. But yea....defs, one TINY mistake at the start means you're screwed
u don't need 15 steps to work out a 3x3 matrix, that's the long method... in fact for any n x n matrix to find the inverse is quite easy...

cofactor method rite?
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tram

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Re: help with 3x3 matrix
« Reply #24 on: March 28, 2010, 10:46:09 pm »
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shit, that's only to find the det, How do you find inverses quickly tt?
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tram

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Re: help with 3x3 matrix
« Reply #25 on: March 28, 2010, 10:47:30 pm »
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and does the easy way work for m x n matricies or just square matricies?
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m@tty

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Re: help with 3x3 matrix
« Reply #26 on: March 28, 2010, 10:54:45 pm »
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Only square matrices have inverses....
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TrueTears

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Re: help with 3x3 matrix
« Reply #27 on: March 28, 2010, 11:05:08 pm »
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Linear algebra by david lay, pg 114 - read example explanation in there, cbf typing matrices up on latex

or read the entire book that is your guide to linear algebra success
« Last Edit: March 28, 2010, 11:16:01 pm by TrueTears »
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m@tty

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Re: help with 3x3 matrix
« Reply #28 on: March 28, 2010, 11:18:08 pm »
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Ahh, can you outline the method? I don't have that book...
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TrueTears

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Re: help with 3x3 matrix
« Reply #29 on: March 28, 2010, 11:26:55 pm »
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http://www.megaupload.com/?d=BD8D7E68

now u have it.

make sure if u have time, read that entire book, it's probs one of the best books out there i've read for lin alg
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