4,570 reputation
519
bio website flickr.com/photos/…
location
age 25
visits member for 1 year, 3 months
seen 8 hours ago

I'm the little trashcan that could!


10h
comment ImageResolution Doesn't Work!
Sort of unrelated, but in general one should always export images as either "PDF" or "PNG"; "JPG" tends to produce ugly graphics due to quantization error, and is better suited for photographs of people.
12h
comment Fundamental group Pi1(SU(n)) and Pi2(SU(n))
Temporarily voting to move this to MathematicsSE, as I don't know if Mathematica can answer this (although I am dumb at topology, so maybe there is a way). But if you could help us understand better by explaining how you would like to use Mathematica to find the answer, I'll remove the close vote.
2d
revised Finding periodicity of multidimensional data?
added 27 characters in body
2d
revised Finding periodicity of multidimensional data?
added 1 character in body
2d
revised Finding periodicity of multidimensional data?
deleted 42 characters in body
2d
answered Finding periodicity of multidimensional data?
Dec
22
comment InverseFourierTransform of simple function takes forever
@Hugh: My math understanding isn't the greatest, but I'm not sure they'll necessarily give the same results. The damped oscillator equation has transient solutions that are not elements of the Schwartz space that the Fourier transform acts as an automorphism on, and I think they get lost in the inverse FT, ie the FT method "misses" the transients. In contrast, the Laplace transform catches them (or something to that effect). However, I have no idea how that generalizes to other ODE's. In any case, this seems to be another area where Mathematica doesn't seem up to date compared to Maple.
Dec
21
comment InverseFourierTransform of simple function takes forever
Back when I was using V7 I noticed this problem when playing around with harmonic oscillators. I've also never had much luck with FourierTransform. Note that as the transfer function of a damped oscillator, the IFT of the expression is a Heaviside theta times a decaying sine wave, namely the impulse response function of the corresponding time domain DEQ (I think?). But hopefully someone else with more wisdom can find a way to get FourierTransform to work here.
Dec
9
comment I am going mixed
LOL the tags are awesome.
Dec
4
comment Get rational and irrational parts
@TysonWilliams: I'm not sure how to handle that case, as I rarely use the abstract algebra functions. However, Daniel Lichtblau might know how to do it, so you could try asking him (or you could ask it as another question).
Dec
4
answered Get rational and irrational parts
Nov
30
comment Is it possible to “pretty print” my input integral in Mathematica like Wolfram|Alpha does?
Also, typing Esc + int + Esc enters $\int$, which I've always found to be far more convenient than using the drop-down menus.
Nov
30
comment For loop catastrophe
Chances are you know this already, but Fibonacci is already built-in to Mathematica, and more generally RSolve is able to symbolically evaluate the $n$th term of many types of recursive equations. However, that's probably irrelevant, as your question appears to be more aimed at the memory-management aspects of this type of computation.
Nov
30
comment Wind Map Artwork
Oops, never mind, they describe where they get the data and technique from in their "Read More" section.
Nov
30
comment Wind Map Artwork
A couple weeks ago I was playing with a Julia script that launches a bunch of particles on a grid leaving trails behind them, and they follow a vector field defined on the grid, generating somewhat similar visual patterns as in the artwork, but it's not exactly the same method. Figuring out how the artists get their vector field and do their plotting will probably be half the work, and the rest will be figuring out how to make Mathematica give a nice-looking picture. Good luck to everyone who takes the time to answer the question!
Nov
30
answered How to make a density plot with composed functions
Nov
28
comment Enumerating tuples from a larger space such that all pairs of values are present at least once
I didn't read too in depth to the problem itself, but seeing as you appear to be looking for an algorithm with the best asymptotic performance to award the bounty to, perhaps it would be helpful to outline some benchmark examples of various sizes, that way you and other viewers can quantitatively compare the performance of the various answers that have thus far popped up, and making the best-performing approach more obvious.
Nov
28
comment Dealing with answers that have Root[ …] when finding an Eigensystem
@chris: % // Normal does nothing. Did you mean % // ToRadicals?
Nov
28
comment Im trying to get the total residual value from a plane of best fit
You previously asked a similar question, which was since deleted because no one could figure out what you meant by "wiggle the plane". Your question title is "Im trying to get the total residual value from a plane of best fit", which was answered in my response to your linked question, since the total residual (or RMS) is given by the third singular value $\sigma_3$, which in your case is 25.8873. If this is not what you are looking for, could you please elaborate on what statistical test you want to do?
Nov
27
comment FindShortestPath with VertexWeight
@shrx: Assuming your start and end vertices are known in advance, you can fix Daniel's proposal by subtracting half the initial vertex weight from all edges emanating from it, and subtract half the end vertex weight from all edges emanating from it. That way, the first and last vertex weights aren't counted.