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bio website xslittlegrass.wordpress.com
location Louisiana State University, LA
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visits member for 2 years, 2 months
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"I want to know how God created this world. I am not interested in this or that phenomenon. I want to know His thoughts, the rest are details." --- Albert Einstein


Aug
14
revised Version 10 cannot print properly?
edited tags
Aug
12
comment Computing and plotting a spectrogram in Mathematica
What does the offset mean? Does it mean the step size of the moving window? For example, if I have a list of 8 numbers and the bin size is 4, offset=2 means every time I advance the 4-number wide window, 2 numbers ahead. Is my understanding correct? Thanks :)
Aug
11
comment Version 10 cannot print properly?
@Jens Thanks for confirming that :)
Aug
11
revised Version 10 cannot print properly?
added 193 characters in body
Aug
11
revised Version 10 cannot print properly?
added 4 characters in body
Aug
11
asked Version 10 cannot print properly?
Aug
7
accepted How to connect to remote kernels inside home router?
Aug
7
revised How to connect to remote kernels inside home router?
deleted 3 characters in body
Aug
7
answered How to connect to remote kernels inside home router?
Aug
6
comment How to deploy a Manipulate object to the cloud that enables SynchronousUpdating?
@Szabolcs I guess I'm interested in both, as long as there is no waiting time between results.
Aug
6
asked How to deploy a Manipulate object to the cloud that enables SynchronousUpdating?
Aug
5
comment How to make Eigensystem in version 10 produce the same results as version 9
@DumpsterDoofus good to hear that :)
Aug
4
comment How to make Eigensystem in version 10 produce the same results as version 9
@DumpsterDoofus Thanks for letting me know. I only tested mac and linux before. I'll test windows when I get home.
Aug
4
comment How get eigenvectors without phase jump?
I practice, I find that requiring the maximum component in the vector to be real is better, since sometimes the first component is very small.
Aug
4
comment How to make Eigensystem in version 10 produce the same results as version 9
@acl Good catch! Yes, I'm solving a 1d lattice hamiltonian! I'm curious how did you know that? The closed form can be written in terms of Mathieu functions (also discussed in The Mathematica GuideBooks), but is only limited to this special potential. Plus, I'm interested in the time-dependent dynamics, so I need the numerical results.
Aug
4
revised How to make Eigensystem in version 10 produce the same results as version 9
added 776 characters in body
Aug
4
comment How to make Eigensystem in version 10 produce the same results as version 9
@Mr.Wizard The eigenvector seems quite different.
Aug
4
asked How to make Eigensystem in version 10 produce the same results as version 9
Aug
4
comment Why does Fourier give a shifted frequency?
@JamesCunnane Yes, I tried something like ListPlot[Abs[Fourier[PadRight[ls - ExponentialMovingAverage[ls, 0.1], 2000]]]^2, PlotRange -> {{0, 10}, {0, .1}}, DataRange -> {0, 1/dt}, GridLines -> {{30/(2 Pi)}, None}, Joined -> True] and it works beautifully. Thanks!
Aug
1
comment Why does Fourier give a shifted frequency?
@LeoFang I guess maybe your are saying the same thing. Half of a cycle of the low frequency in the signal gives a step function, which creates spectrum that interfere with the high frequency peak. I upvoted your answer too :)