Wolfram Mathematica - 2012-08-02

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10:29 AM

@WolframBlogFeed Really COOL :-)

@MikeHoneychurch I have tested SM a bit and I think it's great, expecially in conjunction with MMA

@WolframBlogFeed I also would have liked a simulation of what happens if one opens the door and discovers that the kids have eaten all the ice-cream. it is also clear from the icons that WRI is secretly working on the new Apple iCeCool refrigerator. Lol

1 hour later…

11:54 AM

Can someone with v8 please test if they get: MapIndexed[#2 &,
Table[x y z, {x, 2}, {y, 2}], {-2}](*=>{{z,{1,2}},{{2,1},{2,2}}}*)

Yup, I get {{z, {1, 2}}, {{2, 1}, {2, 2}}} on mma 8.0.0

Seems weird I would expect to only get indexes. Must be due to expressions.

2 hours later…

1:31 PM

Morning

@jVincent well, that's because 1*z simplifies to z

1 hour later…

2:44 PM

    Level[Table[x y z, {x, 2}, {y, 2}], {-2}]

    (* ==> {2 z, 2 z, 4 z} *)

@Rojo Yep, I was confusing my self by suddenly mixing expressions into a previously numerical matrix and not counting on the depth of each element changing.

user image

Advertising on the first page of downloaded PDFs of articles on theoretical physics. What a brilliant idea.

I wonder how WRI marketing missed the opportunity to tell us how, apart from doing your son's homework, balancing your budget etc, mathematica can also do theoretical physics!!!!!!

I wonder what people are taught while doing marketing BScs

3:03 PM

@acl Imagine the following text in that advertisement Should the authors be using our software, they could get the right results

@belisarius did the ad convince you to go back to Maple?

Blog - Stack Exchange: Stack Exchange: now 60 Valued Associates strong!

Shog9 on August 02, 2012

Holy smokes… It’s been over three and a half years since Jeff recruited Valued Associate #00002 to work full-time on building Stack Overflow. In that time, a lot has changed. Jeff’s moved on to teasing us with his next project, Jarrod’s gone from spending his days knee-deep in code to managing the Core dev team and being big in Japan. And there are now 60 full-time employees of Stack Exchange, many hired from within the communities on our sites.

It’s been far too many months since we last introduced any of them, which is a real shame – these folks work hard k …

@Rojo Hi!

@belisarius Hi, long time

yep

3:17 PM

Thunderrr

Do any of you use Maple regularly? I haven't used it the last 4 years or so. I'm wondering how it has progressed in that time.

@jVincent I've only met @belisarius that used it, and I think he's pretty much in the same situation as you

yep. No idea

Seems this guy is pretty lost. I don't know how to let him see the path out

0

Q: Help interpreting Solve[] output

I am after the resulting reccurance relationship but could anyone point out what I am doing wrong here to get this odd output? I've tried doing a replace on the odd characters in the result but I can't produce a plot of anything usefull.

equation-solving

Regarding the tag pdf-format, PDF already stands for "Portable Document Format", -- could we change it to pdf-file instead without confusion?

@Mr.Wizard You may have a pdf as a result of ExportString

3:28 PM

Hummm

A format is not the same as a format format

Kidding

Brb

@belisarius the meaning is still apparent though, is it not?

I suppose we could just use pdf as other SE sites do, and diligently retag any probability function questions...

@Rojo Try FixedPoint[ExportString[#, "PDF"] &, someText]

Well since PDF is the name of the format, it's actually not wrong to write pdf-format, even though it sounds dumb when you expand it.

@jVincent It may not be wrong per se, but it still grates on me.

@Mr.Wizard I don't have strong feelings about that, but pdf-format is clear enough for me

3:33 PM

@belisarius I think I'll start with Nest[ExportString[#, "PDF"] &, someText, 2] just in case

@Rojo you coward

3:47 PM

@mr.w I agree with pdf-file. Only pdf causes people to use it for probability density functions

But I didn't mind pdf-format either for the reasons others mentioned

There's also the symmetry with cdf-format... :D

2 hours later…

5:33 PM

Argh... got bitten by the infamous licensing agreement. I have 2 versions of mma, but can't install one each on two machines because both are tethered to the same license and only one machine/license is allowed

5:47 PM

@R.M google.com/search?hl=en&q=mathematica+free+alternatives

yes, I should learn sage + python. Should satisfy most of my computing needs

@R.M I remember using this spinstop.com/roger/eureka.htm

This guy wants a SolveMyProblem[ ] function. Nice.

0

Q: How Can I use Solve/Reduce Output

Suppose I want x and y to be rationals Solve[x^2 + y^2 == 1, {x, y}, Rationals] I am told: Solve::svars: Equations may not give solutions for all "solve" variables. and given a "solution" {{y -> ConditionalExpression[-Sqrt[ 1 - x^2], (x | y) \[Element] Rationals && -1 <= x &...

The past few days have been incredibly dull

@R.M Did you notice? Agree 100%

flags = CountryData["Europe", "Flag"];
cd = CommonestFilter[#, 2] & /@ flags;
id0 = Flatten[ImageData@#, 1] & /@ cd;
id1 = Tally /@ id0;
id2 = Function[x, Select[x, #[[2]] >= Total[x[[All, 2]]]/200 &]] /@ id1;
id3 = Map[First, id2, {2}];
id4 = Transpose@{id3, flags};
id5 = Grid[ SortBy[GatherBy[id4, Union[#[[1]]] &][[All, All, 2]], -Length@# &], Frame -> All]

Needs a better color space

Nice, but some obvious "close matches" are not grouped

@belisarius That might be it

5:59 PM

yep. not easy

Hue[] does not work either

@belisarius I wonder if that's cause or consequence of me not being around much :P

(dullness)

@Rojo Sure! Keep that self esteem!

@belisarius Hey, one of the options didn't assume high value

what?

The dullness was surely the cause of me not being around

Grrr

I had 11996 rep, half a vote below 12K. Now I go check for news and I dropped 25

6:16 PM

Hehe... some much needed house cleaning was done a little while ago. Go through the delete votes list... there are some more now.

1 hour later…

7:22 PM

Hey @Silvia

@Mr.Wizard I think it's called RAS syndrome :)

Hi @Rojo :)

8:17 PM

@R.M I wonder why. Any ideas?

8:28 PM

0

Q: Mathematica - Dynamic - ListPlot - baseline

I am performing baseline fitting to a raw dataset on a two-state equilibrium process. The process involves fitting the sigmoidal curve to an upper and lower linear baseline, and subtracting so that you get a curve going from y=(0) (state 1) to y=(1) (state 2) over your x-value range instead y=(e...

I think more code is needed in this question.

@acl there are so long data in the post, I just skipped it.

@Silvia also the text is filled with jargon, as if everybody reading it is a domain expert

just like a large number of recent questions

but hey who cares, we have lots of questions!

It's 4:39 in the morning, I just want some small questions for dessert :)

8:46 PM

@acl The questions are

In summary, two questions: 1) screen refresh needed of output from dynamic values for updating dynamic plots not in the same input section 2) multiple plot types within a single graphic, dynamically

No need of such a piece of code for that

Some synthesis management needed

@belisarius OK yes I gave up on the text after the first paragraph (what's baseline fitting? what's a two-state equilibrium process? what's a sigmoidal curve? what's a linear baseline? all in the first two sentences)

@acl Hehe. I did the same ... until I read your comment here :D

well I don't understand why the place is flooded with this kind of question

@acl Because we are attracting traffic, and the world is vast.

@belisarius no OK, I guess my question is why are we attracting traffic now? more advertisements after graduation?

8:52 PM

Yes, we get linked to from the footers of sites like stackoverflow (all graduated sites), which increases our pagerank and where it stands in search results

@R.M Seems we will need more mod work from now on :D

Szabolcs — last seen 6 hrs ago. Poor guy is so addicted, he can't even enjoy his honeymoon without logging in

I got a new laptop (retina) and Mathematica looks like crap

It's the only app I have right now that looks terrible, so it's very annoying. Almost to the point where I can't focus on working

@R.M but why? I have no idea what the OS does with the extra pixels

If the app is not optimized for the display, then it looks extremely pixelated (like viewing a very low resolution text image)

does it scale things up to look the same size as if at lower resolution?

9:04 PM

I guess that's one way to put it, yeah.

ok let me see if I can find something to read about it that's not idiotically critical of Apple or idiotically enthusiastic about Apple

ah, anandtech!

9:22 PM

@R.M ok so you mean it looks pixellated in comparison with other apps, or in comparison with your old screen? I don't see why it should be the second

It looks worse (more pixelated) on the new screen than it did on the old one.

The solution (until WRI fix it) is to run the display at a lower resolution (for everything)

@R.M Over qualification

but why is that? I thought the idea is that it should get scaled up by the OS

In a sense that's exactly what the OS is doing... scaling up an image doesn't work when there wasn't sufficient pixel density to begin with

Other than native apps, those that use the cocoa framework also look crisp (I guess transitioning was simpler for them)

but the overall size of what was a pixel should be the same as before. I don't get it

well anyway that's no wonder, I don't get many things.

anyway serves you right for having a nicer machine than I do

9:32 PM

user image

see the difference?

@R.M aha I get it

that's pretty bad

@acl speaking of nice machines:

user image

My previous machine was second to last

hm mine is .71

then again mine is a macbook air...

so at least I'm cool, right?

0.49.. envy you all!

That's impressive for an air

9:39 PM

@R.M well, it's the fastest

@Silvia but if you think about it it doesn't matter. it's a small difference for most purposes

I mean, I compare it to my 8086 8MHz first machine...

@acl well yes I'm satisfied with my Q6600, it's my graphics card which I dissatisfy most :)

my personal office workstation has an E5540. the air is definitely much faster in use

also, mathematicamark is 0.767 for that machine

of course it has more memory and cores

so I ssh into it from the air :)

@Silvia 0.41 envy even you

@Rojo You are so kind ^^

1 hour later…

10:56 PM

Ok, 2 upvotes now and finally 12k

11:22 PM

@robjohn In addition to being mean, you're a twisted person too now? ;)

@R.M Now please don't do another cleanup until I get to 12030 at least

2

Q: Standard greeting comments

We have already developed a bit of a habit of welcoming new users explicitly in comments, and using the comments to guide behaviour. To made this a bit easier I thought we could collect standard / boilerplate comments here for repeated use. I believe tex.SE does this as well. Now that we are inde...

discussion new-users

@R.M I was playing around with images on the Möbius strip :-)

@R.M "The mean and twisted square" Everyone knew it, but just never dared say it >8(

11:56 PM

@Szabolcs how did that go for you? (Congratulations, BTW)

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