Fun with DEs
Solve the following, anyone?
<pre>
[1 0 1] [e^t ]
X' = [0 0 2] X + [0 ]
[0 0 1] [e^-t]
</pre>
X and X' are vectors, obviously. I got
<pre>
[t] [1] [0]
e^t(c1 [2] + c2 [0]) + c3 [1]
[1] [0] [0]
</pre>
for the undriven case, which I'm fairly certain of, and
<pre>
[te^t(1+K3) + e^t(K1) + .25e^-t]
[2e^t(K3) + e^-t + (K2 - 2K3) ]
[e^t(K3) - .5e^-t ]
</pre>
for the driven case.
Take your best shot; I guess I'm just looking to make sure I'm right.
Last edited by -N-; 05-09-2005 at 09:40 PM. Reason: misprint
Is this supposed to make sense? And how old r u?
Do your OWN DMN homework, lazy@ss! lol . . . the answer is 5
Jack: How do you know?
Will: It's more of a feeling really.
Jack: Well, that's not scientific. Feeling isn't knowing. Feeling is believing. If you believe it, you can't know because there's no knowing what you believe. Then again, no one should believe what they know either. Once you know anything that anything becomes unbelievable if only by virtue of the fact you now... know it. You know?
Will: No.
If Demolition Man were remade today
Huxley: What's wrong? You broke contact.
Spartan: Contact? I didn't even touch you.
Huxley: Don't you want to make love?
Spartan: Is that what you call this? Why don't we just do it the old-fashioned way?
Huxley: NO!
Spartan: Whoa! Okay, calm down.
Huxley: Don't tell me to calm down!
Spartan: What's gotten into you? 'Cause it sure as hell wasn't me.
Huxley: Physical relations in the way of intercourse are no longer acceptable John Spartan.
Spartan: What? Why the hell not?
Huxley: It's the law, John. And for your information, the very idea that you suggested it makes me feel personally violated.
Spartan: Wait a minute... violated? Huxley what the hell are you accusing me of here?
Huxley: You need to leave, John.
Spartan: But Huxley.
Huxley: Get out!
Moments later Spartan is arrested for "violating" Huxley.
By the way, that's called satire. Get over it.
Is this work you want other people to do for you?Originally Posted by -N-
If you explain the theory and what theit is then I would gladly do it for you.
I read this thread, and my heart exploded. (I blame fast food)
Oh alright, I'll say it so that no-one else has to: 42.
Now let's get on with life!
MATHS IS BAD. WHATEVER THAT WAS IS BAD. I THINK IT'S EITHER MATHS OR PHYSICS! :weep:
That's vector analysis, and the only person here who might have a snowball's chance in hell of helping you with it is Dingo Jellybean.
Stop inflicting college-level math concepts on these 13-18 year old forumers, it's pointless.
I took differential equations 2 years ago...and I don't remember how to do that.
Because that's not a differential equation?I took differential equations 2 years ago...and I don't remember how to do that.
=P
The thread title is misleading. This isn't fun.
"As the days go by, we face the increasing inevitability that we are alone in a godless,
uninhabited, hostile and meaningless universe. Still, you've got to laugh, haven't you?"
Um... solve for what?
Last edited by Skogs; 05-09-2005 at 05:48 PM.
You lured me in with fun, then befuddled me
2.9999~ = 3
...
Actually, it is in a way. Notice the X and X'. The equation expresses a relationship between X and it's derivative, thus it is a differential equation.Because that's not a differential equation?I took differential equations 2 years ago...and I don't remember how to do that.
=P
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