Is there some easy way of extracting something that matches a pattern from an expression? For example, I've got some convoluted object with f[x] somewhere in it, and I want to get the x.
@yoda if you can trial it, try. I find it very convenient for writing longer things (it helps with indentation, structuring packages etc). it's not as dynamic as the frontend, but for larger projects it's very useful (or even not so large, for anything over a couple of hundred lines I use the workbench). it has a nice debugger too
@JM It involves a fair bit of signal processing, yes, but I'm not a hardware/hardcore DSP chap. It's probably right to say that I use signal processing a good deal to get results out of my data/interpret them. Recently I've been getting into a bit more on the theoretical side of signal processing than applied and I don't find it as interesting :) Image processing is more of a recent hobby and I'm learning it as I go along
@magma No, I'm not. I just look around for little problems I can solve. I sometimes try working on the blog posts on the Mathworks (signa/image proc) and WRI in the other language and try to learn that way... sometimes, I attempt to answer image proc questions on SO and DSP and learn as I go
Just a thought, going back to the discussion about the site's future logos, if it is in anyway similar to the Mathematica icosahedron, we will have to get sanction from WRI just to avoid any trademark hangups.
@magma You'd think that, but corporations fiercely protect their trademarks even if it is used on a site to promote their products. WRI is no different. For a recent example, LEGO refused rights and had some initial issues with LEGO® Answers, which is why you now see an ® in the site title and everything...
My personal feeling is that, even if there is no objection, it makes sense to have a user contest to design something unique and beautiful and signifying the community.
@rcollyer yes , but let's start make the rules for the contest now (image size, type of image,ect), so when the contest actually starts people are ready with their ideas and we can declare a winner in a week or so.
@All I just recently noticed that there is a red icon in my system tray (right side on Win-PC) which says Wolfram Mathematica 8.01. What is it for. It seems it can be used for quitting. Quitting what?
@ArnoudBuzing I had a CDF in Firefox yesterday and i thought it was related to it, but today I have no CDF and the icon was there again. I now quit it, but I do not see any difference. My MMA session is still on and working.
@magma - It's hard to tell without a screen shot of that area of your desktop. But I highly suspect it is related to the CDF plugin putting an icon in that location. You could get by getting rid of it, then opening a notebook with your browser and seeing if it reappears.
Dilemma: I have a question involving extracting measurements from some pictures I have. The problem I have is it is potentially publishable. Thoughts on how to proceed?
@ArnoudBuzing well this time it went off as soon as I closed the cdf page. Also, the Quit command reset the cdf. So we can say that it works as designed
@magma - I think it is supposed to hang around for a little bit (30 seconds?), just in case a user opens another notebook in a browser. That is done to help with startup time and loading performance issues.
This chat get's saved for the future? Can't you remove what you write when you realise you said stuff that you shoudln't because you're sleepy and have blurred vision?
Oh boy. It's the source of many a meta.so/prog.se rant, most recently, this one
@JM not only that, the Community user auto flags if you write two answers verbatim, if you delete more than 5 posts, if you have two consecutive closed posts, etc...
and on beta sites, it bugs moderators to comment on posts that they've closed.
yeah... well, I suspect this site will have a lot of "more than 20 comments" flags... we were pretty loose with comments on the mma tag and have been warned more than once that we had to cut it out
well, it's just a flag anyway... it's upto the mod to make a decision. Most probably your math mods dismiss those auto flags as nonsense, whereas some on other sites take action
That's what they did to dsp.. they just nastily moved all crap from the signal-processing tag the day it opened up until I yelled and waved sticks at them
I requested that. That was an exact dupe and Heike wanted to copy-paste her answer. I suggested waiting so that it can be moved here wholesale and then merged
@yoda Sorry about that; I had a part in it. There were two unanswered DSP questions in math.SE, and I thought it could get answered there if it were moved...
Heh, no problems. A couple of them weren't bad per se, but they were >1.5 yrs old and the OP had even deleted their account... so we had no clue what they were looking for
I've always noticed than whenever I mention his name in math.SE, he appears to answer or comment a few hours later. So, I was sort of counting on that...
How on earth do this many users on The Great Outdoors get that much rep in one day? There were only 70-odd questions asked, so maximum 1200 points from accepts. That's only enough for the top four users' reps to be where they are, never mind the rest area51.stackexchange.com/proposals/3659/the-great-outdoors
@yoda Speaking of which, there's a question on SO that would definitely be considered off topic there. I've voted to close, but maybe a flag would be more appropriate to have it sent our way. Not that the user has noticed my questions, yet.
Ah, just considered that my gravatar is tied to my email address. Unless I change my email address, which is tied to my Open ID, I can't have a different, Mma generated, gravatar here.
I'm not sure if it's too easy a question for main: is there a way to generate lattices as GraphicsComplex[] objects?
It's pretty easy to make a Table[] of Line[]s or Polygon[]s, but apparently producing GraphicsComplex[] objects is the rage these days for multiple-polygon entities...
@magma The numbers show up when your post, or cumulative posts, is large enough. For a one liner, you'll get a mini-icon next to your name. A bit longer, it grows into a larger icon. Bit more, and it adds in the cumulative rep.
To my mind, the differences are significant if obscure. The very big difference in evaluation was described already by @Sal. Here are several more subtle ones, which may however bite you. So, functions go first.
Functions
Can be in two forms, Function[x,x^2] or Function[#^2] (the last is equi...
Broken scoping is broken scoping, no matter if we use Function or With or := or :>
I think once could construct an example for any of these
@JM In my undergrad, the physics dept shared the building with the chem dept, and there was always good natured ribbing going on. Like "I may be learning about the fundamental interactions in the universe, but you're doing something useful," and the like.
And the organic chem professor was a beanpole who needed to lay off the sugar and caffeine.
There are times when exporting to a pdf image is simply troublesome. If the data you are plotting contains many points then your figure will be big in size and the pdf viewer of your choice will spend most of its time rendering this high quality image. We can thus export this image as a jpeg, png...
When exporting rather complicated plots (especially ListDensityPlot) as a PDF or EPS (for publication, for example), the resulting file size can be quite large. For example:
data = Flatten[Table[{f0, f, Exp[-(f - f0)^2/25^2]}, {f0, 500, 700, 5}, {f, 300,
900}], 1];
plot=ListDensityPlot[data,Pl...
@JM If I click on the little triangle next to my name at the top of the page it says reputation 230 in the today column. What does that number mean then?
@magma Re: "why it does not appear all the time. For ex. i do not see it for you or myself" you have to post enough lines in one block for the rest of your information to have room to display. Notice that on one or two line posts a small avatar graphic is used. On three line posts the large one is used. On longer posts the large graphic and reputation store is used.
@JM I think it has to do with a question that was migrated from SO to here. Apparently the rep I got for my answer to that question was transferred as well but doesn't count towards the daily allowance
@rcollyer I noticed. And the poster of this has asked his question here again.
@Verbeia The first few hours are considered day 0, not day 1. You were the only one to rep cap here, but most likely a lot of folks zoomed to 200 in the first day and then some more the next
@Szabolcs cross-posting is not allowed. I say we swarm and close the SO one if it is a good question and close the mma.se one if it is poor =)
besides, cross-posting doesn't make sense because everyone that used to be there (well, almost) is now here
@robjohn You can, actually... If your email provider accepts + delimiters (since you say you use gmail, they surely do), you can set your email on mma.se to be xxxx+mma@gmail.com and then set a different gravatar for that email. The mails will still go to your xxxx@gmail.com inbox
So he has a 4 by 15 matrix of complex numbers which is mapped to an ordering or something (permutaton) and an extra real number? And need to find an analytic form for that that he can fit? Very vague.
I mean, even if he says: "I have a function $f: Reals -> Reals$ and want to fit it to a model. What kind of model can I fit it to?" it'd be way too broad.
heh, this site is going to be a breeze to moderate... users will do all the closing and stuff — we all pretty much know what's acceptable and what's not
oh, and at 4k (equivalent to 20k in a graduated site), users can also vote to delete answers if they have a negative score. Useful for those half-spam half-helpme posts (if a mod isn't around)
@JM The docs themselves tend to use "fitting" much more commonly than "regression", perhaps that'd avoid some confusion? One should be a synonym of the other if we end up using them.
I vote "and" :-) Two matrix questions are not necessarily linear algebra, and if someone asks about SVD, it might be strange tagged matrix ... on the other hand it's true that it's better to have less tags ... don't know what to say
@MrWizard None of these options changed anything. :-(
Do you guys know whether I can reset all options for the current session (!!!) to their default values?
That printing problem has been bugging me for quite some time now and I'd really like to fix it, since using Latex every time and copying stuff over manually isn't that enjoyable
@David I don't know, but you figure out how to reset programmatically, you could look into $FrontEndSession ... or just backup the config files, and delete them ..
@David Thanks for the upload, but I can not uncompress tar.gz. I am not using my own computer atm.
(So I don't want to install a program that can uncompress)
I'm trouble with the image uploader palette. Any help would be most appreciated:
I have a problem where Column will occasionally cut off a single pixel from the top of images.
To reproduce the problem, evaluate this:
image = Import["http://i.stack.imgur.com/2dEty.png"]
Column[{"text", Image[image, Magnification -> 1], "text"}]
The output I get looks like this in the fr...
I can't let this problem stay, even if it doesn't affect the actually uploaded image. Users will think that the upper row is really cut off, and will cancel the upload.
To my mind, the differences are significant if obscure. The very big difference in evaluation was described already by @Sal. Here are several more subtle ones, which may however bite you. So, functions go first.
Functions
Can be in two forms, Function[x,x^2] or Function[#^2] (the last is equi...
When exporting rather complicated plots (especially ListDensityPlot) as a PDF or EPS (for publication, for example), the resulting file size can be quite large. For example:
data = Flatten[Table[{f0, f, Exp[-(f - f0)^2/25^2]}, {f0, 500, 700, 5}, {f, 300,
900}], 1];
plot=ListDensityPlot[data,Pl...
I have a problem where Column will occasionally cut off a single pixel from the top of images.
To reproduce the problem, evaluate this:
image = Import["http://i.stack.imgur.com/2dEty.png"]
Column[{"text", Image[image, Magnification -> 1], "text"}]
The output I get looks like this in the fr...
