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Old 10-02-2012, 08:22 AM   #101
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Did you not check for exactness? Wolfram will solve a diff eq all day, even second order initial value problems. It sucks though because just last week try started charging to view the step-by-step solution. So now you can get the final answer but any intermediate steps will cost you.

Edit: solution manuals are usually pretty easy to find online and can be a big help as well as they normally show each step for every problem
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Old 10-02-2012, 08:25 AM   #102
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Did you not check for exactness? Wolfram will solve a diff eq all day, even second order initial value problems. It sucks though because just last week try started charging to view the step-by-step solution. So now you can get the final answer but any intermediate steps will cost you.
Yeah M(suby) =/ N(subx) and I forgot how to handle them from there.

That's the infuriating part, I feel I have the concepts down, but its the elementary algebra throwing me around.


I'm just a slow learner with this stuff, by the time Exam #2 comes around I will finally of been ready to take Exam #1. I'm picky with math, I have to understand the concepts of WHY we are doing something, not just HOW, in order to preform even the most basic algebra. Sliding crap around for fun doesn't make since to me which is why I suck at theoretical math and excel at almost EVERYTHING applied.

I'll go try wolfram, thing saved me through Calc but I don't remember it being able to do DiffEq


Edit: Well I'll be d@mned, thing classify and solves them with no issue. Good call!

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Old 10-02-2012, 08:45 AM   #103
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Even pure math has "physical" implications; it just takes more abstract thought to visualize the processes. I used to be the same way re: taking time for it to sink in, but over the years I've gotten better at visualizing the math as I learn it and I've found if I focus on that in the beginning, it makes the rest of the course a lot easier to understand.
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Old 10-02-2012, 08:51 AM   #104
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Even pure math has "physical" implications; it just takes more abstract thought to visualize the processes. I used to be the same way re: taking time for it to sink in, but over the years I've gotten better at visualizing the math as I learn it and I've found if I focus on that in the beginning, it makes the rest of the course a lot easier to understand.

I'm just so left brained man, I'm a jedi at applied stuff but when it comes to just Math for the sake of Math, I have troubles.

Thankfully this is my last "pure" math course
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Old 10-23-2012, 08:43 PM   #105
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I'm just bumping this to b!tch.

Really? I swear my teacher gives us the ugliest numbers on purpose.

8y''+4y'+40y=4cos(2x+(pi/4))


Oh and how many of you took partial diff eq? I have to take it either next semester or next year. I've heard it's a b!tch.
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Old 10-23-2012, 09:53 PM   #106
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Partial diff eq.sucks a fat one...glad that **** us over with

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Old 10-23-2012, 10:23 PM   #107
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Im so glad Im done school.

I just got a job and R and D and I hope I never have to do any of this on the job.
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Old 11-05-2012, 04:44 PM   #108
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i know hes a technical guy like you and all, but damn
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Old 11-05-2012, 04:51 PM   #109
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Im so glad Im done school.

I just got a job and R and D and I hope I never have to do any of this on the job.
I've been on the job for 13 years and never had to do more than basic algebra.
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Old 11-05-2012, 06:45 PM   #110
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thank god for excel
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Old 11-05-2012, 06:59 PM   #111
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Does excel solve DEs?
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Old 11-05-2012, 07:21 PM   #112
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I've been on the job for 13 years and never had to do more than basic algebra.
+1

I've had to figure out some problems using geometry, algebra, and trig, but nothing difficult.

Excel and statistics programs have become my best friend. I do a lot of X bar and R charts, cpk, etc.
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Old 11-07-2012, 01:55 PM   #113
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wolframalpha might be able to solve these?
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Old 11-07-2012, 02:15 PM   #114
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3 weeks in semester left. As long as I make >85 on next test I'm golden.


Hardest math class I've taken yet.

EE's don't have to take PDE
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Old 11-07-2012, 03:38 PM   #115
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Calc II was 10000x harder for me. I've enjoyed this class so far; waves are my sh!t. Not looking forward to PDE at all though...
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Old 11-07-2012, 03:49 PM   #116
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Calc II was 10000x harder for me. I've enjoyed this class so far; waves are my sh!t. Not looking forward to PDE at all though...
I'm good at Calc. DiffEQ its a lot of "if this, then this" kinda stuff where there isn't necessarily a derivation train you can run down.

For example, the proof of a Cauchy-Euler ODE is CRAZY long, when its just easier to memorize when to use it and what it looks like. Calc was far more linear for me.

BSEE out here is great, no EE has to take PDE (even in Tx) but I got out of having to take Linear Algebra as well as Dynamics. This is my last math class until I take Probability and Statistics..which shouldn't be hard in comparison.
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Old 11-07-2012, 03:54 PM   #117
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Stat is a totally different type of math, zero visualization but very applicable to real life. I hated it when I took it but I've since learned to appreciate it. Dynamics was a lot of fun for me because it came naturally and I had to put in zero effort. It really got me started down the path to physics.
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Old 11-07-2012, 04:05 PM   #118
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Stat is a totally different type of math, zero visualization but very applicable to real life. I hated it when I took it but I've since learned to appreciate it. Dynamics was a lot of fun for me because it came naturally and I had to put in zero effort. It really got me started down the path to physics.
Anything applied I own at.

Hence Engineering
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Old 11-07-2012, 04:34 PM   #119
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This is my last math class until I take Probability and Statistics..which shouldn't be hard in comparison.
Make sure you pay a lot of attention in stats, it will become the most important math skill you will have to retain post college. I would highly suggest going even further in stats if you can and have the available electives especially when it comes to proper sample size selection, confidence & reliability, process capability, process validation, etc...
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Old 11-13-2012, 12:26 PM   #120
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edit:I figured it out.

Any of you want to lend a hand here?


I know the general form should be

x1(t)=-C1sin(3t) + C2cos(3t)
x2(t)=C1sin(3t) + C2cos(3t)

but there's something going on with v that I'm not getting. I'm not sure how to incorporate it without knowing A.
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