Regarding this question. My answer is basically the answer to "how do I compute quantum dynamics in the case of a time-dependent Hamiltonian". I think it's a clean answer, and would be useful to anybody wondering how to do this.
Now the question is: assuming the OP agrees (which he might or might not, and I wouldn't go against it), I would like to change the question to ask something along the lines of "I have a time-dependent quantum Hamiltonian; how do I solve for the time evolution of an arbitrary initial state?"
Obviously this is not a site on physics, but since I put in the effort to write the answer it would make sense to make it actually useful.
Waiting in line is a common, though not always pleasant, experience for us all. We wait patiently to be served by the next free teller at a bank, clear the security check at an airport, or be answered by technical support when we call a phone service provider. At a more abstract level, these waiting [...]
@acl That would make sense and would actually be preferable to the current vague title
And such generalizations/minor change in focus of the questions are welcome and preferred (as long as it isn't drastic and doesn't trample upon several other answers) if it makes the situation better (more often than not, the OPs have no clue what they should be asking)
@rm-rf I am mainly wondering how good an idea to have a question like "I want to do quantum dynamics; how?". There are much worse questions around, but...
@acl Does the OP's code have any relevance to what you showed in your answer?
You could just reword the body to "I'm trying to do X in the case of a time-dependent Hamiltonian and this is what I've done. How can I fix blah" and the title to something descriptive
@caveman yeah, there is also fieldOfView but it should be of no importance as its meaning is overridden by focalLength (at least it's value makes no difference in my acrionscript experiments as long as the focal length is specified) there is also this page help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/…
@rm-rf just realized that the OP of that question never accepted a single answer (and ignore my asking to go to a chat room). guess I'll wait a bit and then just change his question
A compiler is a computer program (or set of programs) that transforms source code written in a programming language (the source language) into another computer language (the target language, often having a binary form known as object code). The most common reason for wanting to transform source code is to create an executable program.
The name "compiler" is primarily used for programs that translate source code from a high-level programming language to a lower level language (e.g., assembly language or machine code). If the compiled program can run on a computer whose CPU or operating...
@acl Hence in quotes :) For whatever reason, it didn't get any close votes and even got an answer (of course, because of your exceptional mood these days), so not garbage enough :P
I mean, upvoting is easy, but I don't think anybody else would have answered. It's nice to be friendly but I don't think encouraging people to dump their half-thought-through code here is good.
Well, the point is: moving forward, it'd hurt your answer, the chances of someone else finding the answer, etc. if it is attached to a crappy question, so the onus is on you (since you grok the stuff) to improve the post.
I remember one post from long ago when I used to edit like crazy — it was at -5 or so and after the edit, it slowly climbed to +5 and got good answers (I didn't answer). So yeah, if you have a good answer, fix the question too so that people don't skip your answer just because the question is crappy
I want to solve the time-dependent Schroedinger equation:
$$
i\partial_t \psi(t) = H(t)\psi(t)
$$
for matrix, time-dependent $H(t)$ and vector $\psi$.
What is an efficient way of doing this so that it efficiently scales to high-dimensional spaces?
@rm-rf it's more a question of finding it. if someone searches for "time-dependent schroedinger equation", they should find this (OK I need to edit again to add some keywords, I guess)
Does anyne know if it is possible to install a Mathematica "Application" in a non-standard location so that the documentation will be integrated as well? Without the documentation, it should be enough to change $Path
Yes, I just did that ... I think I really need to read the docs on this in detail. It's not for MATLink, it's for some package I need to share with a colleague.
@rm-rf Did you manage to change the indentation distance in Worbench? 4 spaces are a bit too much. I think I'll soon go back to Vim, I don't like WOrkbench that much
I guess it will interpret one or more of the .'s as separators giving something like 1.1 and 0.1? I can't think in FullForm
@halirutan I have scanned the Wagner book but have found about 17 pages with ink scribblings on it. Could you provide me with scans from your copy of the books?