Maths AHHH

by crumbs • 27 May 2008, 21:59 • Journals
I have an exam tomorrow and don't really understand two major bits.

1. How to find a Givens rotation to zero out a particular entry of a matrix.

2. How to compute the QR factorization of a matrix.

Help wanted!
Comments
21
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spng 27 May 2008, 23:03
youu do 4man smg in rtcw, you dont need maths!

anyway gl :O
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flame 27 May 2008, 23:04
dunno, maybe next year :D

edit: all i can do is wish you luck success for tomorrow ;)
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spiROZE 27 May 2008, 23:12
QR factorization of a matrix:
http://www.netlib.org/lapack/lug/node69.html

dunno if that helps but I used googled for it :) prolly you also already did that :p

good night man
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rize 27 May 2008, 23:15
that wont help too pure explanation
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Thomm 27 May 2008, 23:12
Matrix, eh?

There is no spoon.
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rize 27 May 2008, 23:14
1. didnt understand in english what u mean :p
2. not difficult, but a little bit elaborate/lavish (dunno which is the right adv. :D)
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crumbs 27 May 2008, 23:17
the text is from the lecturer, and i didnt understand the first bit, thought it was just cos i didnt know anything about givens rotation :P

for the QR factorization any method, they will give us easy numbers in the exam, (university 2nd year).
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rize 27 May 2008, 23:19
u will get an 3*2 Matrix for QR-Factorisation in ur TEST im pretty sure
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crumbs 27 May 2008, 23:25
I don't know how to do it and havent found any good examples on google

2000 Exam Paper

Perform one iteration of the QR algorithm for the matrix

A =

9 1 0
1 4 1
0 1 1

Express your working to three significant figures.
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rize 27 May 2008, 23:54
too much to write, btw u asked too late :p
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Snorfiets 27 May 2008, 23:15
First you take a pen and some paper, draw a circle, draw a square in it, draw another circle somewhere, and then tear the paper apart and start gaming.
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Owzo 27 May 2008, 23:25
would if i could mate
i got my GCSE maths (lolololololololololololololololol) on Monday XDDDDDDD
gl in urs, wish me luck in mine ;D
Wales
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Splodge 27 May 2008, 23:32
One sheep + One sheep = Two sheep

<3
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rahula 28 May 2008, 02:15
It's one sheep with 4 eyes and 8 legs. The abdomen merges upon addition.
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Owzo 28 May 2008, 10:32
makes me lol everytime mate ;) baaaa :D
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nebu 27 May 2008, 23:35
uhh easy bash imo lol
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elecc 28 May 2008, 00:33
yes, because in loekinos island we get proper education
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nebu 28 May 2008, 01:33
<3 omg u made my day xD
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stKz 27 May 2008, 23:44
haha gl, hated maths in skwl :p
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sAs1 28 May 2008, 03:32
I still dont get how people can add and devide and shit Alphabetical letters and numbers together...its a big lie ! a+2? ye right fuckers =(
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