For 22 years, Wolfram Research has been developing technology to allow subject matter experts to bring their ideas and documents to life with interactivity. This week, as part of his keynote at the O’Reilly Tools of Change for Publishing Conference, Theodore Gray, Co-founder of Wolfram Research and Founder of Touch Press, gave the first demonstration [...]
@JM yes. but if you look at the RSS it's just the first few lines of the post. there's gotta be a setting in wordpress somewhere to include the full contents of the post
30 days running and excellent statistics on Area 51, congratulations to all participants!
However, there is no time to rest. First of all, we need proper decoration. Here's some confetti:
Graphics@Table[{
RGBColor @@ RandomReal[{0, 1}, 3],
Translate[#, RandomVariate[NormalDistribution[]...
30 days running and excellent statistics on Area 51, congratulations to all participants!
However, there is no time to rest. First of all, we need proper decoration. Here's some confetti:
Graphics@Table[{
RGBColor @@ RandomReal[{0, 1}, 3],
Translate[#, RandomVariate[NormalDistribution[]...
I hate it when SE employees jut in and do what they think is right when they know nothing about the subject... thought they'd have learnt from the math.se and Jeff sagas...
Consider the following toy example:
Hold[{1, 2, x}] /. x -> Sequence[3, 4]
It will give
Hold[{1, 2, Sequence[3, 4]}]
because Sequence[] (like Unevaluated) is expanded only in the first level of heads with attribute HoldAll.
How can I obtain Hold[{1,2,3,4}]? What is the simplest way to...
@Szabolcs in your question, you do not want to evaluate the list at all, right? ie, if I had a=5; Hold[{a, 2, x}] /. x -> Sequence[3, 4], you'd like Hold[{a,2,3,4}] and not Hold[{5,2,3,4}], right?
@Szabolcs Tomas didn't flag it. I don't know if someone else did, but it is entirely possible that Robert saw it himself because it was on top of the SE hot questions list all day
Well, admittedly the criteria for accepting an answer are subjective (which solution is prettier?) but I don't think that makes it a bad question. There is a clear problem (making pretty confetti pictures or animations), and several solutions were posted.
It's basically the same style which I used in the Newton Fractal I posted yesterday, where you need one part to be evaluated and the rest of the expression must stay untouched. Yours is a bit harder though
@halirutan You might know the answer to this: what's the best way to collect results in a compiled function when the number of results is not known? AppendTo is slow (O(n^2)) and Reap/Sow are not available.
OK, I'm reading this, which I did not do last time
@halirutan but maybe you can just tell me if reading that post in detail will answer my question
I've been looking at 500's question here and could use some help reasoning through a couple of things.
They are wanting to test whether the images pairs are symmetric. I would expect that the first thing one would want to do is reflect the second image in the pair over the y-axis via Transpose[{-1,1}*Transpose[ data ]]. Does this make sense?
The reason I ask is that the results surprised me a bit. I looked at the euclidean distances between spatial medians (and just plain old means). The images all "look" symmetrical but these distances are seem to be approximately normal centered at 2.
This would suggest that they aren't symmetrical but my gut tells me I must have done something wrong in either the transformation or by using EuclideanDistance to compare.
When we don't know the number of results that will be generated, the usual way to collect results is Reap/Sow. Another alternative is linked lists. Neither of these are available in compiled functions.
AppendTo does work, but it has an $O(n^2)$ complexity, so it will be unacceptably slow for l...
He said he was ok with simply closing it and leaving it to us to reopen a while ago.. we could've done it if the mods were around, but users can't migrate back from meta
but the condition was that we try to polish it into a proper question with a goal — i.e., "How can I blah this confetti code to use Heike's IRL research to make it realistic"
I guess we're ok... we've been pretty good about our site and scope and closing off-topic/discussiony questions, so a little fun once in a while is good. I guess the fun was had by all, then some drama, and now back to business =)
I study human vision and more specifically eye-movements.
"If we display 2 symmetrical patterns (20 min one after the other), will our gaze distribution be symmetric is my research question."
The 2 figures at the bottom row below is what is displayed to subjects for 3 seconds. One pattern, then...
as far as I can tell, the real question is "what is a good measure of similarity in this context", which isn't really a well-defined question on mma. am i missing something? I don't want to downvote it or anything, just trying to understand
Up till now, it is the glue that sticks a lot of mathematical/logical concepts together - things I've read on Wikipedia, or that I've been only briefly introduced.
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well, i thought the interesting claims lacked sufficient justification. then again, as I said, it was a superficial reading, and I may well be biased against it by reading what people I think highly of think of it. in any case my opinion on this is not to be taken seriously, I think.
@AndyRoss The backtick business is a bit hit-and-miss... both techniques seem to work on chat and in comments, but not on questions/answers. So much for consistency...
30 days running and excellent statistics on Area 51, congratulations to all participants!
However, there is no time to rest. First of all, we need proper decoration. Here's some confetti:
Graphics@Table[{
RGBColor @@ RandomReal[{0, 1}, 3],
Translate[#, RandomVariate[NormalDistribution[]...
Consider the following toy example:
Hold[{1, 2, x}] /. x -> Sequence[3, 4]
It will give
Hold[{1, 2, Sequence[3, 4]}]
because Sequence[] (like Unevaluated) is expanded only in the first level of heads with attribute HoldAll.
How can I obtain Hold[{1,2,3,4}]? What is the simplest way to...
I study human vision and more specifically eye-movements.
"If we display 2 symmetrical patterns (20 min one after the other), will our gaze distribution be symmetric is my research question."
The 2 figures at the bottom row below is what is displayed to subjects for 3 seconds. One pattern, then...
