"thebigbossyboss" (thebigbossyboss)
09/23/2014 at 19:52 • Filed to: None
1
23|
"thebigbossyboss" (thebigbossyboss)
09/23/2014 at 19:52 • Filed to: None | 1
| 23 |
But first safe bait so people who hate math don't have to see it.
If you have a 3x3 matrix...let's say
it looks like this:
a b c
d e f
g h i
what are your leading principal minors? Just the determinants? (so a(ei-fh) - b(di-gf) + c(dh-eg) ? Or is principal minors something else?
Many thanks. Sorry I bring maths in here so often. It's hard.
macanamera
> thebigbossyboss
09/23/2014 at 19:53 |
|
4
RamblinRover Luxury-Yacht
> thebigbossyboss
09/23/2014 at 19:54 |
|
Funny, I've taken linear algebra, and though I've forgotten much, I don't remember ever knowing what a "leading principal minor" was. If I did know, it must not have been important.
|
thebigbossyboss
> macanamera
09/23/2014 at 19:56 |
|
Of course. 4.
|
thebigbossyboss
> RamblinRover Luxury-Yacht
09/23/2014 at 19:57 |
|
It's probably not, but when you're asked to justify your answer using "leading principle minors" knowing what they are helps.
|
RamblinRover Luxury-Yacht
> macanamera
09/23/2014 at 20:00 |
|
Such a cheap unhelpful troll post. But oh, how I laughed.
jariten1781
> RamblinRover Luxury-Yacht
09/23/2014 at 20:00 |
|
Same, I have no idea what that term means. Granted linear algebra was one of two courses I genuinely despised so I may have a PTSD block.
|
RamblinRover Luxury-Yacht
> jariten1781
09/23/2014 at 20:01 |
|
It was a course so nice, I took it twice.
(D->B, IIRC)
|
thebigbossyboss
> jariten1781
09/23/2014 at 20:02 |
|
My dand brother are both engineers and said the same thing.
|
macanamera
> RamblinRover Luxury-Yacht
09/23/2014 at 20:08 |
|
Or maybe i just told you the meaning of life and the universe.
|
macanamera
> thebigbossyboss
09/23/2014 at 20:08 |
|
Duh
|
jariten1781
> thebigbossyboss
09/23/2014 at 20:10 |
|
Engineer here as well. The class is too mathy and we have computers for that crap. Why relearn what the pinheads in the math department are already experts in when you can be building or blowing up stuff?
MasterMario - Keeper of the V8s
> RamblinRover Luxury-Yacht
09/23/2014 at 20:11 |
|
same here...my thoughts were "the fuck is that?" Even though I've taken linear algebra
BZiel
> thebigbossyboss
09/23/2014 at 20:12 |
|
Here ya go, easy see?
https://www.khanacademy.org/math/precalcul…
|
thebigbossyboss
> BZiel
09/23/2014 at 20:14 |
|
Ohhhh many thanks!
|
BZiel
> thebigbossyboss
09/23/2014 at 20:18 |
|
Math, and fixing cars, makes my living :-)
What can I say...
Axial
> jariten1781
09/23/2014 at 21:29 |
|
Plot twist: Linear Algebra is not actually a math course, it is a vocabulary course.
I took it three semesters ago and I also have no idea what a "leading principle minor" is.
vicariousILive
> thebigbossyboss
09/23/2014 at 22:09 |
|
I'm sure Matlab has a built in function for that
Jordaneer, The Mountaineer Man
> thebigbossyboss
09/23/2014 at 22:27 |
|
heres how I do it.
1. Insert values into the matrix.
2. make sure matrix has correct values, (I just made these up).
3. type in the power of -1 and then evaluate.
4. be happy because this took all of about 30 seconds.
(I'm using a ti-84 C silver edition)
you can do this for pretty much any size matrix.
|
thebigbossyboss
> Jordaneer, The Mountaineer Man
09/23/2014 at 22:34 |
|
Indeed. Thanks.
|
thebigbossyboss
> vicariousILive
09/24/2014 at 07:43 |
|
Probably. Doesn;t really help me show my work on my math assignment though.
|
vicariousILive
> thebigbossyboss
09/24/2014 at 08:57 |
|
That was a smart ass comment that really didn't come across as one. Joking aside, when I was in college if I saw the solution to a couple problems I could usually correctly work the problem, until you understand the process at least. Had some other people I knew that relied too much on the solutions manual... That will most certainly back fire at test time
|
thebigbossyboss
> vicariousILive
09/24/2014 at 09:01 |
|
Yeah. I actually am understanding it now. The solutions are useful to point you in the right directions. Principal minors is just the main diagonal on the minors matrix.
|
vicariousILive
> thebigbossyboss
09/24/2014 at 10:06 |
|
a lot of that linear algebra stuff is bogus. But a lot if it is a very useful tool. I say pass the class and then let the magic Matlab come to light