Wolfram Mathematica

12:03 AM

Obviously, it is not the fastest thing on earth. If we do a 100 by 100 table, it takes a lot of time. But for now I'm only looking for the Mathematica concept of a Spreadsheet

P. Fonseca

12:16 AM

I can almost spreadsheet images. This is a new concept! I put one cell equal to an image, and then put a second cell equal do the first cell, but lighter. Just need to resolve small details with evaluation control...

P. Fonseca

12:29 AM

Lots of details needed: DynamicModule to keep the variable alive, data versus formating data structure; sliders and other dynamics inside cells; inport from Excel (a simple parser should be easy); Automatic transformation of a Mathematica spreadsheet into a customized app interface (taking out non used cells and exporting into a CDF)...

acl

1:31 AM

should this

-3

Q: Why are recent entries in Windows Start Bar never up-to-date

Running Windows (5,6,7), I have always pinned Mathematica to the Start Bar. This feature offers the Recent files for a quick load. However, the list has never been up-to-date. By never I mean, with any version of Windows I have used over the years and with any version of Mathematica up to vers...

windows

really be closed and downvoted? OK it's expressed as a rant, but it's a genuine question and is in fact answered

I'd go for reopening (@rm-rf ?)

acl

1:53 AM

@rcollyer so I gather your defence is today/tomorrow? best of luck!

Mike Honeychurch

2:04 AM

@P.Fonseca not sure how relevant this is but there is a third party app called BestViewpoints (or similar?) which looks like it is a spreadsheet like app built with Mathematica. ...if it is any good may be better than reinventing the wheel?

rm -rf

2:49 AM

@acl (I didn't vote either way) I just don't see it as an mma specific question, as it's more an operating systems 101 question — each app always shows the list of files opened from within it. The confusion might've arisen from not thinking about the explorer/finder as apps themselves. If not NC, I'd probably say TL. In any case, if people want to reopen, I won't stop it.

acl

@rm-rf actually in that case I thought the question worthwhile because I finally realized what the difference is between which "recently opened" files are shown by the Dock menu and mathematica itself (and quicksilver/launchbar in OS X)

but maybe it is too localized

rm -rf

Let me see if I can find a home for it on Super User...

acl

@rm-rf I pinged you as the last person voting to close and a moderator (you volunteered, didn't you :) )

yes superuser sounds better as this amounts to a question on what is shown in the recently opened lists in various places

rm -rf

@acl I don't mind being pinged anytime for any reason, regardless of whether I voted or not :) I might not always respond right away...

0

Q: Why are recent entries in Windows Start Bar never up-to-date

Running Windows (5,6,7), I have always pinned Mathematica to the Start Bar. This feature offers the Recent files for a quick load. However, the list of files has never been up-to-date, i.e., I can never access my most recently opened Mathematica files. I would agree that it is not very importa...

windows

We'll see if they reject it.. if they do, then it'll come back here and remain closed (as OT).

acl

@rm-rf oh no.... I hovered my cursor over my name in the comment there, and I DON'T EXIST! oh dear.

terrible :)

rm -rf

3:04 AM

Must've gotten lost in the warp zone

acl

@rm-rf as an aside, how's the sublime text thing going? given up? (I spent most of the last few days using it for both coding and finalizing papers, which is why I'm asking)

rm -rf

@acl Oh, I haven't used it actively... I got busy the past few days and holed up in the MATLAB IDE :)

Brett Champion

3:30 AM

@AndyRoss How's it going?

rcollyer

4:07 AM

@acl tomorrow at 3 pm local time. I'm going to be flambeed. But, I will survive: either I will have initials, or I won't. It is mostly out of my hands now.

Rojo

4:30 AM

Do you guys think it's safe and a good enough idea to just add new properties to TemporalData, or that I should do it in a dynamic environment as leonid usually suggests?

In the meantime, dynamic environment it is

Brett Champion

@Rojo I think it's a bad idea, but I'm interested to know what properties you want to add.

Rojo

@BrettChampion What a bad idea, adding them without a dynamic environment or adding them at all?

Well, given that now there's a wrapper for time-value pairs, I see myself using it a lot for the special simple case of equally spaced times

For those cases, I could use a "TimeStep" property, and a "TimeExtension" (or some other name) for the length of the domain, the "TimeStep" times the "PathLength"

Szabolcs

@Brett I missed that message, I wasn't around unfortunately :(

Brett Champion

@Szabolcs I was going to ask how you like Indiana so far.

Szabolcs

4:45 AM

@BrettChampion Haven't been outside of South Bend yet, but I like it here

Should take the time to visit Chicago finally

Brett Champion

@Rojo The main concerns (off the top of my head) are how it would work with saving the notebook and whether it would kill some of the performance. Andy is the expert on TemporalData, though.

Rojo

@BrettChampion I see... Well, it's a property, so it would get evaluated before saving the notebook just like other functions I think. I'll ask andy

Thanks

Brett Champion

@Szabolcs I mean that, if you take TemporalData[{2, 1, 6, 5, 7, 4}, {{1, 2, 5, 10, 12, 15}}] and evaluate it, you get something that looks like TemporalData[Panel[1]]. But this actually contains all the original information, even if you kill the kernel. I'm guessing that it wouldn't preserve your custom properties, however.

@Szabolcs Do you have a car? (Though driving in Chicago can sometimes be intimidating for people who aren't used to it.)

@Szabolcs And you should get over to see the dunes at some point, though that's more of a warm weather activity.

P. Fonseca

6:55 AM

@MikeHoneychurch Thank you for the info. Last Time I saw it, it was just a "view". I want the interactive building of the calculation.

Going to have a look again. But I think it is mainly based on data analysis, and not on free building (plus, it is not free).

Oleksandr R.

8:56 AM

@EliLansey that fixed it for me. Weird that disabling internet access doesn't also do this. I guess this is a bug.

I think the issue may be partly because I have IPv6 set up but no IP address or any routes configured, so it times out. Looks like this check is done asynchronously using the new libcurl functionality added in M9.

Ajasja

9:35 AM

Finally installed mma9. But it set mm8 to trial mode as well... :/

At least no BOSD this time

Fixed it

(just switched the lines in the mathpass file)

P. Fonseca

10:33 AM

Linked to this question: mathematica.stackexchange.com/questions/14658/… there is a small app for windows (called insideClipboard) that shows all the different formats that were saved to the clipboard. It would be nice to have inside Mathematica an import converter, that is, a tool that reads the different formats available, and for each one, suggests different past possibilities.

Giovanni

11:23 AM

Is there a simple way to center the ouput?

acl

11:38 AM

@Giovanni of what? where?

@rcollyer nah don't worry about it. it'll be fine. and anyway it's out of your hands, so...

Giovanni

@acl In Mathematica output, inside the notebook. I would like to center the output of an expression, using code.

acl

@Giovanni CellPrint[Cell["abc", "Text", TextAlignment -> Center]]

but probably that's not what you want

Giovanni

@acl Thanks, I'll give it a try.

acl

@Giovanni I mean if you're more specific then maybe I can help. But this as it is is not very useful

Giovanni

@acl I managed to center the output using the Format > Text Alignment menu option, but if I clear all the output, I have to do it again. So I thought if I could set this inside my code.

Output of a cell.

acl

11:52 AM

@Giovanni well, what I sent centers the string "abc". if you want to center something else, try defining pc = CellPrint[Cell[ToString@#, "Text", TextAlignment -> Center]] & then eg pc[132]

but this won't work for graphics (for instance) or typeset formulas since it converts to strings

you could assign it to $Post to do this for everything, but that's not a good idea the way I wrote pc

I guess I mean, you really do need to be more specific.

and maybe ask it as a question on the site if you want a robust solution

Giovanni

I don't know how I could specify more, sorry. But yes, I'll search a little more, and maybe ask on the site. Thanks

acl

@Giovanni I mean, what sort of thing do you want to center? graphics? text? typeset equations? etc

@Giovanni actually try $Post = CellPrint@Cell[ToBoxes@HoldForm@#, TextAlignment -> Center] &

then Plot[Sin[x], {x, -5, 5}] or TraditionalForm[Cos@x/Sqrt[1 + x^2], x] seem to work

no guarantees though

(it prints Null if there is no output)

Giovanni

@acl I want to center tables. Inside the tables are Strings e and equations.

Your code worked, but turned Strings into this "string"

acl

12:07 PM

@Giovanni well I don't know what you mean by a table... Probably best to ask this on the main site (try to be specific so people can answer your actual question, rather than randomly trying to guess as I did :) )

Giovanni

@acl A table using TableForm. hehe. right. Thanks

ungerade

1:07 PM

Hello i have a question but i don't really know how to search for it: I want a table with elements a1[x],a2[x].... of course Table[ai[x], {i, imax}] doesn't work. How do i do that properly?

I think it's not really the right level for a "real" question on the frontpage ;)

Oleksandr R.

@ungerade hello! I agree, it's not really a front page question, so thanks for asking here. How about this: Symbol["a" <> ToString[#]][x] & /@ Range[imax] ?

ungerade

@O

@OleksandrR. Thx, works! I thought there is some easier way ;) like "a\i" which says you mean "i" the variable! But thanks anyway!

Oleksandr R.

@ungerade afraid not. Actually what you want to do is quite unusual in Mathematica. A more typical way to achieve it would be to have a[i][x] or a[i,x], in which case you can use Table.

Or, indeed, Through@Array[a, imax][x].

ungerade

@OleksandrR. that's how i did it ;). But when i print the eqations they look very unnatural for a non-mathamatica guy

@OleksandrR. that's how i did it ;) was referencing to your first comment a[i][x]

Oleksandr R.

@ungerade how about a /: MakeBoxes[a[i_], form_] := InterpretationBox[SubscriptBox["a", i], a[i]] first before using Through@Array[a, imax][x]?

ungerade

1:22 PM

@OleksandrR. let me see what that does ;)

Wow! Very nice! It works but i get when i just enter:

MakeBoxes[a[i_], form_] := InterpretationBox[SubscriptBox["a", i], a[i]]
Through@Array[a, i][x]

Array::ilsmn: "Single or list of non-negative machine-sized integers expected at position 2 of Array[2,i]."

Array::ilsmn: "Single or list of non-negative machine-sized integers expected at position 2 of Array[2[x],i[x]]. "

(but it works very nice, i think i need some time to understand it properly as a mathematica beginner, but is very nice to see how one can do that)

Oleksandr R.

@ungerade yes, you need to give an integer in that position (corresponding to your imax). BTW, you really should use TagSet like I showed and not set a DownValue on MakeBoxes directly.

ungerade

1:38 PM

@OleksandrR. alright ! Very nice! Thx for the support.

Oleksandr R.

@ungerade you're welcome!

Ajasja

Like the new mma9 interface uplift. It's snappy and useful.

Does anybody know if this is on purpose (that the Image3D is blurry?) Mathematica graphics

Oleksandr R.

2:29 PM

@Ajasja yes, it's on purpose. The blurring comes about because the blocks are semitransparent. From different angles it's more or less blurred.

Andy Ross

3:17 PM

@Rojo, there are some undocumented properties for TemporalData that can be obtained via "DeveloperProperties" I don't claim that these are tested or won't change so use with caution. There is a "MinimumTimeIncrement" property that gets that time step you are after for uniformly spaced data.

4

@Rojo as for adding properties to TemporalData. You can add basic key-value type properties via MetaInformation. This mechanism is a bit experimental so I'm keen to know how it works for you and how you end up using it.

Eli Lansey

@OleksandrR. what ended up working for you?

Oleksandr R.

3:41 PM

@EliLansey disabling checking for documentation updates. But, in addition to having disabled internet access.

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