How can I detect and peel the label from the jar below (POV, cylinder radius, jar contents are all unknown)
to get something like this, which is the original label before it was stuck on the jar?
@rojo @verde Today, my son got his first Spanish lesson at school (some additional voluntary stuff; it's not in the main curriculum). His teacher is someone from Uruguay. So, how does the local dialect there relate to General Civilized Spanish™ ?
Yeah, that's what I meant with that it doesn't respect scoping constructs. Perhaps that could be done by injecting an arbirtary symbol inside the expression, say blah, then wrapping it in Module[{blah}, Hold@expr], extract the symbols from both and only the intersection of both lists of symbols are actually extracted
@Rojo I think Leonid's dependency graph generator probably solves this problem reasonably well. The remaining difficulties I think will be things like variables called Subscript[x,2] and so on. For those you need to rename them or wrap them up in Internal`LocalizedBlock.
@Rojo yes, I agree. I would not be surprised if Simon knows that it's a common enough thing to want to do and that a lot of people probably already had solutions they were using (or at least approaches to the problem), and so asked this question to get a survey of the methods people use.
I'm sure there is some internal function that already does this or something similar... I remember certain functions like ProbabilityDistribution automatically replace x with \[FormalX] regardless of the value of x
@R.M in this case context is usually very helpful. Variables that explicitly represent parameters of a distribution or some other mathematical object are much easier to deal with.
Jin intends to print some site minicards for promoting Mathematica.SE at the WRI conference.
I suggest to posting here the questions we consider appropriate, and voting on those.
Jin's guidelines are:
The idea is that when we pass out these cards to people, the questions are so interesting ...
@J.M. The anecdote runs that the wife of another physicist (Gamow?) was teaching him, when he said -"wait ... there is an equivalent way of doing this"- and showed her what he thought a brilliant discovery. She answered -"That is called reverse knit, and is for dummies"-
@J.M. Here you have a version of the same anecdote, physics swapped:
Dirac discovers purling Another time, Dirac was watching Anya Kapitza knitting while he was talking physics with Peter Kapitza. A couple of hours after he left, Dirac rushed back, very excited. "You know, Anya," he said, "watching the way you were making this sweater I got interested in the topological aspect of the problem. I found that there is another way of doing it and that there are only two possible ways. One is the one you were using; another is like that. . . . " And he demonstrated the other way, using his long fingers. His newly discovered "other way," Anya informed him, is well …
My kid is studying orbitals with a friend besides me. They haven't explained them anything about QT, the exclusion principle, ... nothing. Grrr. It's all magic
@J.M. But at least they could mention something about why s,p,d,f are not a continuum, and why the ionization energies are so different between elements
(To be fair, I already had a fuzzy idea about s,p,d,f orbitals (and I've even seen the spherical harmonics pictures) when I was 12 or so, but I did not encounter the subtleties until I was 16 or so...)
A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: "What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise."
The scientist gave a superior smile before replying, "What is the tortoise standing on?" "You're very clever, young man, very clever," said the old lady. "But it's turtles all the way down!"
on the orbitals, my chemistry teacher made a point of discussing whether the orbitals exist or not if they're occupied; I don't remember which she claimed. but she clearly thought it an important point
had a phd from (I think) Imperial, too...
even then I could tell it was rubbish (although I already thought most of what I was told was rubbish, so...)
@GustavoBandeira think of it this way: suppose you know how f(x) looks. then, f(x-1) will do the same thing as x, except that what happened at x will now happen at x-1. so, what was at 0 will now be at -1
The question is
how can we use Mathematica to create vectorized versions of low-resolution images? The goal is to get an image suitable for quality printing at any resolution.
Since "true" vectorization performed by various specialized software is a tough problem, I suggest to consider "artistic...
Conceived around 1947–1948, while the composer was working on Sonatas and Interludes,[2] 4′33″ became for Cage the epitome of his idea that any sounds constitute, or may constitute, music.[7] It was also a reflection of the influence of Zen Buddhism, which Cage studied since the late 1940s. In a 1982 interview, and on numerous other occasions, Cage stated that 4′33″ was, in his opinion, his most important work.
How can I detect and peel the label from the jar below (POV, cylinder radius, jar contents are all unknown)
to get something like this, which is the original label before it was stuck on the jar?
