Wolfram Mathematica

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12:32 AM

Hi guys, I'm trying to use Image3D to plot some data where the opacity varies radially, but it looks like concentric rings: imgur.com/fXOeDkP Does Image3D have a limited number of opacity levels?

Or maybe is my install not set up to display enough colors?

Code here: pastebin.com/hV8DDzJh

Meta

1:07 AM

Q: My question on PointSize usage is off-topic?

On my question concerning how to control the PointSize of a dot on a plot in version 10 of Mathematica got two close votes for being "off topic". However, neither of the closers made a comment saying why they thought it was off topic, so I am wondering why they would have thought it was off topic...

F dot Floss

1:46 AM

Is there a page I can read on patterns for functions like DeleteCases?

I'm reading reference.wolfram.com/language/tutorial/… but it doesn't actually help

I have a really simple question but either it's undocumented because it's considered so simple, or I'm just searching in the wrong place

For example, how do I delete the negative values from a list, mylist? I tried DeleteCases[mylist,_<0] or DeleteCases[mylist,_Integer<0] but neither work

Ahh, I got it to work with DeleteCases[mylist,x_/;x<0], but I assume there's a better awy?

Michael Hale

2:17 AM

@FdotFloss Study Select, Cases, Condition, and PatternTest in the docs. You used Condition. Alternative methods include: Select[mylist,NonNegative], Cases[mylist,_?NonNegative], Select[mylist,MatchQ[_?NonNegative]], etc.

F dot Floss

@MichaelHale, thanks!

1 hour later…

F dot Floss

3:29 AM

Mother of god I want to murder MM right now

this stupid "template notebook" bar at the top won't go away, it doesn't have an obvious way to close it and I don't see anything in any of the menu bars

Why would they possibly design something like this

I have no idea why it popped up either, some random keystroke seemed to

6 hours later…

Yi Wang

9:30 AM

What I have been doing recently: Install v10.0.0, then Remove v9.0.1, then re-install v9.0.1, then install v10.0.1, then remove v9.0.1, then re-install v9.0.1. Any idea when v10.0.2 comes so I can continue this cycle?

Pickett

9:56 AM

@YiWang Why do you have to remove V9? I didn't have to on OS X.

@FdotFloss As a last resort perhaps create a new notebook a copy the cells over to that one.

Murta

10:17 AM

@Szabolcs I sow this comment from you. Have you studied Java?

I'm studying it right now... I would like to know how It was for your.

1 hour later…

halirutan

11:23 AM

@YiWang (@Pickett) I guess the (re-)installation cycle was necessary to finally settle at 9.0.1 as the alternatives are too buggy :-)

1 hour later…

Szabolcs

12:24 PM

@Murta Very little. I never used it seriously, and I never learn enough of it to be able to make much use of it ...

Meta

1:07 PM

Q: When an "external link only" answer can be considered valid

I've mixed feelings about this. An external link (book, article, code) could solve completely the OP's problem. But considering it a valid way to answering may lead quickly to ridiculous situations (I spare here some gedanken examples born out of my particular sense of humor), not to speak of th...

discussion

1 hour later…

belisarius

2:13 PM

Guillochon

2:45 PM

OK, I guess I'll post my question on the site.

hhh

3:41 PM

Can someone explain why the partial derivative is zero?

or in generally all partial derivatives are calculated to zero there. I want to specify to Mathematica not to do it. Show partial derivatives in the last deduction, how is it possible?

Wolfram Blog

4:04 PM

Wolfram Blog: The Nobel Prize in Physics

posted on October 01, 2014 by Richard Asher

The Nobel Prize in Physics ceremony is upon us once again! With the 2014 winner set to be revealed in Stockholm next week, we at Wolfram got to wondering how many of the past recipients have been Mathematica users. We found no less than 10 Nobel Prize–winning physicists who have held Mathematica licenses. That’s at least [...]

blochwave

4:44 PM

@WolframBlog Oooh, my chances of a Nobel Prize are on the up again!

Vitaliy Kaurov

FYI

A: Circuit drawing in Mathematica

This is an alternative answer. If you have latest SystemModeler 4 you can visually create a model there and then import it into Mathematica: Needs["WSMLink`"]; WSMModelData["MathematicaExamples.Modeling.ElectricCircuit.LowpassFilter"] You can also create models in Mathematica programatically...

2 hours later…

hhh

6:59 PM

I forwared my question here because got no attention above and provided there easy-copy-paste code to try things :)

3 hours later…

F dot Floss

9:44 PM

Hi everyone, is there a good way to make nice PDFs using MM? like, including format and such?

like, if I want to have a series of boxes that all have variations of the same three plots, or something

Pickett

@FdotFloss You can export the notebook as PDF. Or you can put the plots inside Grid and export that grid as one PDF, with styling. Is this what you are looking for?

F dot Floss

@Pickett, maybe. I know about exporting the notebook as a PDF, but I don't really want the code used to produce my images in the PDF

The plotting in a grid might work

Lemme experiment with taht

@Pickett, I think this is almost exactly what I'm looking for, thanks! Is there any way to format it so like, one grid takes up half the width of the page or something?

Pickett

9:59 PM

@FdotFloss PDF is vector graphic format, so they don't really have a size. You can display them at any size. Do you intend to print the PDF that you export as it is or do you intend to include it in a report through for example Latex?

The point is, it makes a difference here what your end-goal is. I don't know how printers work but if they blow up the PDF to full width, perhaps you could play with ImageMargins and ImageSize of the Grid. You would set it so that ImageSize = 2xImageMargins on each side. That would make the grid centered on the page, if that is how printers work.

F dot Floss

@Pickett thanks, it's mostly just to show on a projector, but to save me the trouble of having to copy and paste/insert a million plots in a latex doc or powerpoint doc or something

Pickett

@FdotFloss Ok, now I understand better what you are trying to do. It seems like Grid doesn't have the ImageMargins/ImageSize options that I was talking about, I misremembered.

Still, you're goal should be to create white space somehow on either side. I'm not sure what the best way is. Obviously adding extra columns in the grid and putting white rectangles in them will do it, but that's probably not the best way.

F dot Floss

@Pickett good enough for me!

I'm pretty sure my MM code would make anyone who's good at it tear their eyeballs out

Pickett