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Smart people do this math problem (pg. 3)
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| Nrg2Nfinit |
| quote: | Originally posted by piggy
Since I'm bored..
| 400 300 300 | | 5000 |
| 200 160 120 | | 2400 |
| 1 1 -2 | | 0 |
| 4 3 3 | | 50 |
| 5 4 3 | | 60 |
| 1 1 -2 | | 0 |
| 4 3 3 | | 50 |
| 0 4-(5/4)*3 3-(5/4)*3 | | 60-(5/4)*50 |
| 1 1 -2 | | 0 |
| 4 3 3 | | 50 |
| 0 1/4 -3/4 | | -5/2 |
| 0 1-(1/4)*3 -2-(1/4)*3 | | 0-(1/4)*50 |
| 4 3 3 | | 50 |
| 0 1/4 -3/4 | | -5/2 |
| 0 1/4 -11/4 | | -50/4 |
| 4 3 3 | | 50 |
| 0 1/4 -3/4 | | -5/2 |
| 0 0 -11/4+3/4 | | -50/4+5/2 |
| 4 3 3 | | 50 |
| 0 1/4 -3/4 | | -5/2 |
| 0 0 -2 | | -10 |
| 4 3 3 | | 50 |
| 0 1/4 -3/4 | | -5/2 |
| 0 0 1 | | 5 |
| 4 3 3 | | 50 |
| 0 1/4 0 | | -5/2+(3/4)*5 |
| 0 0 1 | | 5 |
| 4 3 3 | | 50 |
| 0 1/4 0 | | 5/4 |
| 0 0 1 | | 5 |
| 4 0 0 | | 50-5*3-5*3 |
| 0 1 0 | | 5 |
| 0 0 1 | | 5 |
| 4 0 0 | | 20 |
| 0 1 0 | | 5 |
| 0 0 1 | | 5 |
| 1 0 0 | | 5 |
| 0 1 0 | | 5 |
| 0 0 1 | | 5 | |
DUUUUUUUUUUUUUUUUUUUUUUUUUDE
NEOOOOOOOOOOOOOOOOOOO |
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| Krypton |
Piggy, you are awesome. Finished the assignment, took me 3 hours...:-/
I don't remember ever using Gaussian matrices in high school... |
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| PatMcGroin |
MATLAB!
:D
edit: or a beautiful ti89 will do the same. rref is very useful but i hate that they make you waste your time in class doing it. its too time consuming. if you can setup the equations then thats all that really matters. any proper calculator or computer will do the calculations for you. its just a very slow process where you really gotta watch yourself in order not to up.
what class is this for? linear algebra? |
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| d-miurge |
| quote: | Originally posted by PatMcGroin
what class is this for? linear algebra? |
In France it's taught in Première (= 11th grade). |
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| Meat187 |
| quote: | Originally posted by PatMcGroin and others
MATLAB!
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What loser needs Matlab for this? It's just three variables and a well-posed problem. I've had problems with far over 10.000 equations and variables. That's when you need Matlab!
| quote: | Originally posted by d-miurge
In France it's taught in Première (= 11th grade). |
Right after the course on how to be a pretentious frog-eating fag, I presume. |
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| d-miurge |
| quote: | Originally posted by Meat187
Right after the course on how to be a pretentious frog-eating fag, I presume. |
Deffo. See you in the Internet-serious-business course. |
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| Meat187 |
| quote: | Originally posted by d-miurge
Deffo. See you in the Internet-serious-business course. |
I teach that one, you know? :p |
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| PatMcGroin |
| quote: | Originally posted by Meat187
What loser needs Matlab for this? It's just three variables and a well-posed problem. I've had problems with far over 10.000 equations and variables. That's when you need Matlab! |
yes, matlab is not needed. congrats.
i just like bringing up matlab every chance i get. ive had many teachers that live and die by it. and everytime i stumble across matlab i like to yell out MATLAB as it makes me laugh thinking about how one of my professors says it. |
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| Meat187 |
Fun fact:
I once spent almost half an hour re-entering "why" over and over in Matlab. |
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| skatemple |
| quote: | Originally posted by SuspicionVandit
The substitution from above(shadow_419) is what I was taught and it's very easy. |
yes, but thats only for 2 equations, not 3 |
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| jerZ07002 |
| I may be wrong, but this seems like a pretty easy calculus problem. I last took a math class in college (some level of calculus) about 5 years ago, but i remember doing equations similar to these. I took a calculus based course called operations management that did very similar problems. The class was focused on the allocation of resources. I think differential calculus covers this; i may be wrong. |
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| shadow_419 |
| quote: | Originally posted by skatemple
yes, but thats only for 2 equations, not 3 |
Doesn't matter since it's a system of equations they are all related. It doesn't matter which two equations you pick or which variable you eliminate first. Once you eliminate a variable through substitution solve for the next variable, substitute again, and solve for the last variable standing. You use this number to find the values of the other two variables. :D Can't believe I remember this crap, I graduated high school in 94 seems like a long time ago |
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