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laplace trasform
- Thread starter shem
- Start date
(I.e., s^2 + 8s + 4 = 1/s)
Ratch, why are you calling this a false equation? It has three real solutions in s, with approximate values -7.4, -0.8, and 0.2.
Mark
silvrstring
- Joined Mar 27, 2008
- 159
Yeah, I think the OP meant to post X(s)*(s^2+8s+4)=1/s.
shem, do you have the original differential eqn--and what you've done so far?
shem, do you have the original differential eqn--and what you've done so far?
Maybe that's what he meant, but he didn't say anything about applying it only to the left side.
silvrstring
- Joined Mar 27, 2008
- 159
Hey guys, the whole thing needs to be solved.
If the OP had written X(s)*(s^2+8s+4)=1/s, then it would have been clear that the problem is already in the s-domain. Then, X(s) = 1/[s*(s^2+8s+4)].
Solving L^(-1)[X(s)] would give the answer the OP is looking for, but he hasn't posted any work...at all.
I think he thinks this is a magic answer box. Not even a "Hello." Just type in the problem and wait. Rude.
If the OP had written X(s)*(s^2+8s+4)=1/s, then it would have been clear that the problem is already in the s-domain. Then, X(s) = 1/[s*(s^2+8s+4)].
Solving L^(-1)[X(s)] would give the answer the OP is looking for, but he hasn't posted any work...at all.
I think he thinks this is a magic answer box. Not even a "Hello." Just type in the problem and wait. Rude.
It's not clear to me what "Yes he did" is agreeing with, since there are two statements in the thread just before your reply: "Maybe that's what he meant" and "he didn't say anything about applying it (Laplace transform) only to the left side."
If you meant "Yes he did" to apply to the second statement above, I disagree. His exact words were, "inverse laplace transform of s^2+8s+4=1/s". You are apparently interpreting what shem wrote as if there were parentheses on the left side, which there clearly aren't, nor which it would be reasonable to assume their presence. I agree that it would be meaningless to apply a Laplace transform (or any other operation that results in a change of value) to only one side.
