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Stack Exchange

16:31

rcollyer has made a change to the feeds posted into this room

rcollyer

There is a MathematicaTip twitter feed. I added it as an RSS message feed into this room. If it gets annoying, let me know. But, they generally only post once a day.

Stack Exchange

17:04

Attach a progress indicator to long computations: Monitor[Table[Integrate[1/(x^n + 1), x], {n, 20}], ProgressIndicator[n, {1, 20}]]

Tweeted by MathematicaTip on May 7, 2013 at 8:04 PM

Vector and stream plots of vector fields: StreamPlot[{1 - x + y/2, 1 + x}, {x, -3, 3}, {y, -3, 3}]. http://j.mp/ni6qNZ

Tweeted by MathematicaTip on May 8, 2013 at 7:33 PM

Be the first to hear about the latest additions to Wolfram Finance Platform. Join us May 22 at the virtual conference.http://j.mp/131oSWD

Tweeted by MathematicaTip on May 9, 2013 at 8:51 PM

Split a list into sublists according to a specified function: GatherBy[{1, 2, 3, 4, 5, 6, 7, 8}, PrimeQ]. http://j.mp/lTExfI

Tweeted by MathematicaTip on May 10, 2013 at 9:06 PM

Partition a list into consecutive triplets: p=Partition[Range[8], 3, 1]. Apply a function to each triplet:Times @@@ p http://j.mp/kOeT9X

Tweeted by MathematicaTip on May 13, 2013 at 8:39 PM

Szabolcs

17:16

@rcollyer It's good practice to add the new feed as a ticker feed, wait for the initial flood, and then change it to a message feed. (Just for the future, I made the same mistake myself.)

@rcollyer Since you're working with this, here are two very annoying things:

Plot[Sin[x], {x, 0, 10}, AxesStyle -> Arrowheads[Small]] <-- bad image padding

Plot[Sin[x], {x, 0, 10}, AxesStyle -> Arrowheads[0.05]] <-- good image padding but I wanted absolute arrow sizes in printer's points ... this gives relative sizing. Still, it appears to be a good workaround until you do ...

g = Plot[Sin[x], {x, 0, 10}, AxesStyle -> Arrowheads[0.05]]; GraphicsRow[{g, g}] <-- bad image padding again

I can use Row instead of GraphicsRow, but then I can't do this: Export["figure.pdf", Show[graphic, ImageSize -> 12 centimetres]], i.e. adjust the final figure size while keeping font sizes constant (e.g. a constant 12 pt to match the text's 10 pt font, and not something arbitrarily rescaled for every figure)

Q: Why do Arrowheads interfere with ImagePadding?

In a recent posting, Belisarius solved a problem related to the display of arrows on the x and y axes by setting ImagePadding->None. My question is: why do the parameters of Arrowheads interfere with the default settings of ImagePadding? Or is something else going on? The following illustrates...

Dominic Michaelis

the chat got another symbol ?

Szabolcs

I don't have to prove that I like Mathematica, but looking at problems like this one I can't help but wonder if these are really the result of some fundamental design deficiency of the core language. One needs a lot of discipline to write a high quality and bug-free package. It's just so easy to shoot oneself in the foot.

And so difficult to see where even mildly complicated solutions might go wrong.

@DominicMichaelis I don't think so.

Dominic Michaelis

i got the stack exchange chat symbol on the browser tap instead of the mathematica stack exchange logo

halirutan

@Szabolcs You might be interested in this here chat.stackexchange.com/transcript/message/9417686#9417686

@rcollyer You are probably interested in the above link too.

rm -rf

18:06

@Szabolcs Wow, that is messed up... also, the arrow head is not centered on the line

Rojo

18:24

@rm-rf You there?

rm -rf

@Rojo What's up?

Rojo

@rm-rf Alo, I just wanted to ask

if it is a good idea or frowned upon to eventually cross post my image processing question to dsp.stackexchange

given that I don't mind a Matlab answer, or a general one that I can translate to MMA

rm -rf

@Rojo You can cross post by changing the focus from mma code to algorithms/ideas/implementations

Rojo

Thanks!

belisarius

hiya

Rojo

18:28

@belisarius Evening

rm -rf

@Rojo Nikie is the resident expert there as well, so if he has seen it here, it's as good as hoping to get an answer on dsp (but certainly, there are others who can throw out ideas)

belisarius

@Rojo Hi red

@Rojo You too, traitor

Rojo

@belisarius Why traitor?

belisarius

@Rojo "I don't mind a Matlab answer"

t-r-a-i-t-o-r

Rojo

@belisarius Ok, ok, only answers with TextRecognize

belisarius

18:32

better

@Rojo Have you seen this:

Solve[E^( a w) (f - e) == E^(b w), {w}]

try it

Rojo

Tried it

belisarius

Now this

Solve[E^( a w) (f - g) == E^(b w), {w}]

and ? ...

ha!

Rojo

@belisarius Well, they only implemented the methods for letters up to e

4

They need to copy paste some more for v10

belisarius

@Rojo curious, isn't it?

Rojo

@belisarius Lame

belisarius

18:36

@Rojo I can't understand why that is happenening

And i have fiaca to follow the trace

Rojo

@belisarius I gotta go, I should have left 10 minutes ago

So what better time to trace that

Let's see

belisarius

@Rojo :D

rm -rf

@Rojo Isn't 10 minutes ago equivalent to being early by 20 minutes in Argentina? :P

Rojo

@rm-rf For everything except the time to leave my job, that's true

Ok, gotta go, cound't trace it this fast

rcollyer

@Szabolcs I was not aware of that. Sorry. :(

Rojo

18:43

If I can make the Earth rotate from E to W for half hour, I'll be in time

Bye people

rcollyer

@Szabolcs that's interesting, I'll look into it.

@halirutan I saw that. Do you have a new jar file up, yet?

rm -rf

19:01

@rcollyer Your IDEA should automatically indicate an update (and yes, the jar is up)... halirutan is sleeping, apparently.

rcollyer

@rm-rf I had pulled down the git repository, and the jar had not been updated. And, I did not want to pull down the java sdk, yet, to rebuild it. But, I had not thought to run "Check for updates ...".

@Szabolcs the workaround is to adjust the ImagePadding yourself.

Plot[Sin[x], {x, 0, 10}, AxesStyle -> Arrowheads[Small], ImagePadding -> 11]
g = Plot[{Log[x + 2], 1}, {x, 0, 8.5}, AxesStyle -> Arrowheads[Small],
ImagePadding -> 11]; GraphicsRow[{g, g}]

It's not perfect, as GraphicsRow will clip the Ticks, but with minor fiddling, it should get you where you want to be.

rm -rf

19:18

@rcollyer It is now... anyway, the check for updates would probably be more convenient

rcollyer

@rm-rf I pulled it down from git as I wanted the latest, and I like to poke at the code. Not that I can tell you what I've been doing with it ...

and, that whole lack of a java sdk ...

rm -rf

@rcollyer I've never understood the reasons behind the seemingly arbitrary image padding that is applied in GraphicsRow/Column/Grid and in a few other places, but it is almost certainly the main reason I still go back to LevelScheme — I just don't want to fiddle with stuff that is fragile

rcollyer

@rm-rf I understand, your frustration not the image padding algorithm.

@rm-rf per this comment, are there one sentence questions that require a lengthy explanation in Mathematica? (in physics: why is the sky blue? is the usual suspect)

rm -rf

@rcollyer "What is the difference between Module/With/Block?"

rcollyer

19:44

@rm-rf that's a good one. I wasn't coming up with one, but figured their were several.

Stack Exchange

20:47

Visualize HSB color space: Graphics3D[{Hue[#], Cuboid[#, # + .1]} & /@ Tuples[Range[0, 1, .2], 3], Lighting->"Neutral"].

Tweeted by MathematicaTip on May 14, 2013 at 8:21 PM

Stack Exchange

22:11

Blog - Stack Exchange: Podcast #47 – Do You Even Twitter Bro?

Alex Miller on May 14, 2013

We’re Back! It’s been a while since our last podcast (why you ask – listen to find out!) but we’re back now and “stronger” than ever. It’s Joel, David and Jay (plus producer Alex and Abby) coming to you from the brand new SE Podcast Studio (check out the picture below)

News of the day: we’re finally in our new office (and podcast studio). We’ve got hexagonal offices (and therefore crooked hallways), and a cool café area. AND HEATED TOILET SEATS. And a kitchen with a giant walk-in refrigerator, for our interns (which we don’t have). …

halirutan

23:42

@rcollyer Yes. It's even in the Jetbrains repo so a simple update in the settings should do it.

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