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August 01, 2025, 04:01:37 am
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Author Topic: Dekoyl's Questions  (Read 14585 times)  Share 

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/0

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Re: Dekoyl's Questions
« Reply #15 on: February 28, 2009, 04:44:22 pm »
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"I think" it should be

To see how dilates, find

So it is a dilation factor of from the y-axis.

We did this in Methods CAS :P
« Last Edit: February 28, 2009, 04:47:38 pm by /0 »
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dekoyl

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Re: Dekoyl's Questions
« Reply #16 on: February 28, 2009, 04:46:52 pm »
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^Oh okay. Was wondering about that :P

Thanks /0!
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squance

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Re: Dekoyl's Questions
« Reply #17 on: March 01, 2009, 03:08:24 pm »
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Yes both answers are valid.
Because one is just multiplied by a factor of -1.

*I need someone to correct me if im wrong*
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dekoyl

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Re: Dekoyl's Questions
« Reply #18 on: March 01, 2009, 03:14:28 pm »
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Quote from: squance on March 01, 2009, 03:08:24 pm
Yes both answers are valid.
Because one is just multiplied by a factor of -1.

*I need someone to correct me if im wrong*

The original post was:
Quote
When finding eigenvectors, I can get an answer of:
and from one eigenvalue.

Are both valid answers?

Thanks squance. =]



« Last Edit: March 01, 2009, 03:41:15 pm by dekoyl »
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dekoyl

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Re: Dekoyl's Questions
« Reply #19 on: March 01, 2009, 03:41:19 pm »
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Oh and also, is there a difference for using or . One is from the textbook and one is from wikipedia/teacher's notes. I seem to get different answers.
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squance

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Re: Dekoyl's Questions
« Reply #20 on: March 01, 2009, 03:43:11 pm »
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Not sure if there is a difference, but I have always been taught to use det(A-lamda I) = 0(the second one you typed up).
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dekoyl

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Re: Dekoyl's Questions
« Reply #21 on: March 01, 2009, 03:46:03 pm »
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Whew I think I finally got it now. A combination of Melbourne Uni's notes, my teachers notes and the textbook works well :P

Thanks for all the help squance!
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squance

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Re: Dekoyl's Questions
« Reply #22 on: March 01, 2009, 03:50:35 pm »
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No worries.
I just had a look at my textbook and my linear algebra notes. And I realised that the textbook had the first formula you typed out and my lecture notes had the second formula you typed up...

EEK!
That has now mindboggled me...,....
IM CONFUSED! :( :( :( :(
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dekoyl

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Re: Dekoyl's Questions
« Reply #23 on: March 01, 2009, 03:54:47 pm »
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Quote from: squance on March 01, 2009, 03:50:35 pm
I just had a look at my textbook and my linear algebra notes. And I realised that the textbook had the first formula you typed out and my lecture notes had the second formula you typed up...
Yeah =S I'm ignoring the textbook's one for now (Anton and Rorres). Try using both for a simple question? I might've made the same arithmetic error over and over again (no surprises there) but for one of my questions I got
by using one formula, and by using the textbook's formula.
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dekoyl

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Re: Dekoyl's Questions
« Reply #24 on: March 02, 2009, 05:38:24 pm »
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Squance: I learnt not to bother with using .

Another one =\:
When we want to find a matrix such that it diagonalises matrix , do the order of eigenvectors matter (this affects the columns of )?

Thanks


Edit: Actually nevermind. Got it now :P (From what I picked up, it does not matter unless the question asks for a specific matrix.)
« Last Edit: March 02, 2009, 05:50:59 pm by dekoyl »
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dekoyl

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Re: Dekoyl's Questions
« Reply #25 on: March 15, 2009, 08:17:35 pm »
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Greetings again. :P

When we find the volume of a parallelpiped with non parallel sides (and given vectors ),
do we still use to find the volume?

Thanks
« Last Edit: March 15, 2009, 10:11:19 pm by dekoyl »
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/0

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Re: Dekoyl's Questions
« Reply #26 on: March 15, 2009, 09:26:36 pm »
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how can a parallelepiped have non-parallel sides?
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dekoyl

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Re: Dekoyl's Questions
« Reply #27 on: March 15, 2009, 09:31:13 pm »
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Quote from: /0 on March 15, 2009, 09:26:36 pm
how can a parallelepiped have non-parallel sides?
Yeah that got me confused but that's the exact wording.
"Determine the volume of the parallelpiped with nonparallel sides given by the vectors..."

I'm just going to still applies. =\ Hmm.

« Last Edit: March 15, 2009, 10:10:58 pm by dekoyl »
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dekoyl

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Re: Dekoyl's Questions
« Reply #28 on: March 15, 2009, 09:55:21 pm »
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 I used and got a volume of 0. =S Ah crap.
« Last Edit: March 15, 2009, 10:10:29 pm by dekoyl »
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Mao

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Re: Dekoyl's Questions
« Reply #29 on: March 15, 2009, 10:03:18 pm »
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mmm small question, why ?

The box product is a scalar,
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