Question

hey is a/o good with linear algebra?

Answer 1

have you tried to do it...do a parabolic fit with 3 collinear points?

Answer 2

no i don't know a/t at all

Answer 3

I am stupid LOL

Answer 4

ah...ic

Answer 5

are you using the normal equations to do curve fitting?

Answer 6

well to be honest with u i didnt open up my linear algebra text book yet i was too busy with calc and i need to hand this in so i got pretty desperate LOL

Answer 7

but i am gonna check it out

Answer 8

This week we r learning only abt linear equations i think does that make sense?

Answer 9

ok r u still there?

Answer 10

yes

Answer 11

oh ok so basically linear algebra and a lil of matrices

Answer 12

Curve fitting is an immediate application of systems. In general, n distinct points (where no x-values are the same) will be sufficient to generate a polynomial of degree (n-1) that includes the given points. Thus, 2 points are needed to determine a line, three points are needed to determine a parabola, and so forth. Curve fitting is a big aspect of statistics, in which data is modeled by curves. This is a stepping-stone toward regression, which is discussed later in this course. Finally an interesting application for flow through a network is presented.

Answer 13

u r gonna kill me soon i see it in ur eyes haha

Answer 14

to do a quadratic regression you need to compute

\[(A^{T}A)^{-1}A^{T}b\]

have you done anything like that?

Answer 15

\[A=\left[\begin{matrix}1&x_1 & x_1^2 \\ \vdots & \vdots&\vdots\\1&x_n& x_n^2\end{matrix}\right]\]

Answer 16

I am not sure

Answer 17

so we started a lil of matrices but we just touched on the basics

Answer 18

also I don't know what your book is calling the 'method in section 1.3'

Answer 19

LOL

Answer 20

you should probably do some reading on section 1.3...then if you still have issues them bring them back to the forum

Answer 21

LOL ya that may be a good idea :D

Answer 22

Hey thanks for the advice

Answer 23

Thanks for comin over :D

Answer 24

np

Answer 25

Sorry for driving u insane. It was kind of rude of me

Answer 26

I just wanted to go to bed its like 3 A.m. here so i was trying to get the easy way out but i guess i am doomed i will have to start studying the material Hehe

Answer 27

i guess no sleep tonite for me XD

Answer 28

you on the east coast of the US?

Answer 29

i am cst

Answer 30

i think so at least

Answer 31

i am from Toronto canada

Answer 32

ok

Answer 33

no i am EST sorry abt that

Answer 34

Where r u from?

Answer 35

I know :) I know where Toronto is

Answer 36

Pennsylvania

Answer 37

oh cool what time is it over there?

Answer 38

2:54

Answer 39

same time as me lol

Answer 40

yep

Answer 41

so y r u still up?

Answer 42

I had a sore throat that was keeping me up

Answer 43

lol and then u sit on os and help others

Answer 44

I'm a mathematician ... that is what I do.

Answer 45

oh ya cool so u have a phd in math?

Answer 46

yes

Answer 47

hey that is my goal

Answer 48

good

Answer 49

it's a nice life

Answer 50

so where do u teach?

Answer 51

i am not sure if i have the brains

Answer 52

I don't give out that information :)

Answer 53

lol

Answer 54

hey when i become the next billionaire u wld wish i hadtold u

Answer 55

ok ;)

Answer 56

*u will wish u had told me

Answer 57

i know what you meant ;)

Answer 58

there is an intruder uhoh :O

Answer 59

zarkon will u save me from that guy??

Answer 60

I have that kind of power now...but I wont..I'm going to let him get you

Answer 61

noooo way!!!!!!

Answer 62

OHHH he is gone few

Answer 63

lucky for you

Answer 64

r u leaving?

Answer 65

I probably should...it's now past 3am

Answer 66

lol ya with a sore throat u shld be heading to bed LOL

Answer 67

Hope u dont have strep i

Answer 68

I took some pain medication and it is feeling a little better now

Answer 69

oh good but dont drug urself up hehe

Answer 70

nope...I don't do that :)

Answer 71

night

Answer 72

good night see u around

Answer 73

hey u became my fan