Wolfram Mathematica

John Joe

00:57

How do you copy graph legends to latex?

I copied the code, and pasted it in latex, but it's saying there is still an error.

b3m2a1

09:26

@PatrickStevens There were actually a number of long discussions on those Live CEOing twitch streams about the name. Can't remember what all they proposed (but most of them sucked).

kirma

"Version 11.3.0 is now available" - except it's nowhere to be seen on my user portal page.

b3m2a1

Somehow I feel like 11.3 is a bit of letdown. I was really hoping for the new Compile and obviously very little is going to top the new chemistry paclet @JasonB. is developing. There's also nothing like the paclet repository that I hear should be coming out sometime in the fall or much else really aimed at the development crowd.

2

Nasser

@kirma they always say this. But it always takes few days for new version to show up at user portal. I do not see it either. I just checked.

b3m2a1

I do like the idea of revamped presentation tools, though. I was actually just working on a chunk of presentation functionality myself and hopefully theirs does what I was developing and more.

kirma

09:44

@Nasser Yep, not the first time this happens...

Nasser

nothing new in Manipulate/CDF area. No new controls. Nothing new in this area for long time now. I wonder if WRI is no longer interested in Manipulate and CDF stuff.

I just found out, I can't get Mathematica to solve any 1D wave PDE on finite domain analytically. For example, a string motion, with fixed ends. The most simple PDE, Mathematica can't solve. I was going to post a question on this. I wonder if this is known. Here is an example

ClearAll[u,t,x];
pde=D[u[x,t],{t,2}]==D[u[x,t],{x,2}];
ic={Derivative[0,1][u][x,0]==0,u[x,0]==x*(Pi-x)}
bc={u[0,t]==0,u[Pi,0]==0};
sol=DSolve[{pde,bc,ic},u[x,t],{x,t}]

The above is string fixed on both ends. Zero initial velocity, with some initial position (plugged string). Mathematica can't solve this. I also tried on 11.3 on the web. No solution. Should I post this question on main site?

opss, sorry, my mistake. I had error. It should be
bc = {u[0, t] == 0, u[Pi, t] == 0};
silly me. Now it can solve it.

Szabolcs

10:01

Are any of you familiar with Modelica? Now that M11.3 can run SystemModeler models, but does not actually include SystemModeler itself (I assume what's missing is the authoring environment), I was wondering how big of a limitation this is. Can we still do most useful stuff by writing Modelica code?

@JohnJoe Graphics can't be pasted into LaTeX, only text can. You need to export graphics from Mathematica, then use \includegraphics in LaTeX.

Nasser

@Szabolcs I never used Modelica, since it needs separate app. But I do not really understand how is one supposed to use the new feature in 11.3 to run these models, since Mathematica itself can not generate them? Is one supposed to allready have Modelica just to generate these models and then run them inside Mathematica? Why? If someone already have Modelica, they can run them already there. I do not understand this part.

Szabolcs

10:45

@Nasser That is basically my question.

I imagine that if someone else has already generated a model using SystemModeler (its graphical interface), then that model can be run in Mathematica.

My question is basically: if I don't have SystemModeler, I can't use its GUI to make a model. But can I still write Modelica code in a plain text editor and make use of it in Mathematica, without any access to the full SystemModeler?

My understanding is that Modelica is an open language, with multiple implementations (one of which is SystemModeler).

Modelica

Modelica is an object-oriented, declarative, multi-domain modeling language for component-oriented modeling of complex systems, e.g., systems containing mechanical, electrical, electronic, hydraulic, thermal, control, electric power or process-oriented subcomponents. The free Modelica language is developed by the non-profit Modelica Association. The Modelica Association also develops the free Modelica Standard Library that contains about 1360 generic model components and 1280 functions in various domains, as of version 3.2.1. == Characteristics == While Modelica resembles object-oriented ...

Kuba

@Nasser No real updates for FE/GUI sucks. There are whole frameworks introduced in kernel while we don't even get old bugs fixed.

OK, there is this presentations stuff but it is too specific, we need more tools/functions to develop apps like new presentations, not specific solutions.

Nasser

11:01

I honestly never understood why we have so many questions, where people write 20/30 lines of words explaining the problem they are having, and not include one single line of code to illustrate it. It seems most people lost some basic common sense in this modern age :) I do not know what else it could be.

6

@Kuba right now, I just generate animated GIF files for all my simulations. This can run in HTML with no plugin or anything. And makes it easier to run by anyone. Do not generate CDF's any more.

I will wait until one can run CDF's on the cloud from any where, with no cloud credit or anything like this. But I am not holding my breath to see this.

Kuba

@Nasser I imagine your apps make use of variety of solvers which just need to be run by the kernel even if you transfer everything else to JS.

Nasser

@Kuba I mean, I just making animated gif, from the manipulate itself. So I just generate a PNG file. I sometimes generate few PNG files to cover different conditions. There is no javascript at all involved. just animated gif files :)

Kuba

@Nasser yes, but you'd like interactive we cdf, right? Or just an animation?

Nasser

I have a button below each animated GIF file to run/stop it. that is all. very simple.

Kuba

I must say I don't really remember what exactly costs credits lately

Nasser

11:11

@Kuba yes, I prefer interactive ofcourse. But animated GIF files is just a short-term solution. If I generated CDF, no one will run them. No body wants to download files and install things these days.

Kuba

@Nasser have you been playing with CloudDeploy@ListAnimate and friends?

Nasser

@Kuba here is examples I made 12000.org/my_notes/PDE_animations/index.htm all these animated GIF files generated by Mathematica.

@Kuba I have not,. I have not touched cloud things for long time. do dynamics works OK now on the cloud? I do not like the idea of paying credit to have someone run a simulation I make.

Kuba

@Nasser Thay are very limited. But ListAnimate with a pregenerated frames of simulation is just for displaying stuff. Maybe that does not cost credits. I need to investigate later, I don't remember

Nasser

@Kuba you are an expert on these cloud and dynamics things. Last time I tried it (2 years ago) many things did not run well (Dyanmics). So I did not look at it again. I've been also trying to learn JS programming to make interactive simulations using JS. I can now make very basic animations in JS.

Kuba

@Nasser so working with cloud stuff lead me to learn JS aswell :) Wish I had more time for that and I didn't waste so much trying to figure out many cloud features.

Nasser

11:26

@Szabolcs "My understanding is that Modelica is an open language, with multiple implementations (one of which is SystemModeler)." Yes. This is correct. But It will be very hard to get companies to use Modelica, when Matlab has the simulation market all cornered with simulink. Every engineer I know at these companies uses simulink. Maple also is trying to get into the engineering simulation market. They have MapleSim as well. Not sure if Maplesim uses Modelica language or not.

kirma

Quick googling would suggest MapleSim either heavily relies or at least supports Modelica...

yode

12:13

Implicit entity don't be support now?

I'm in version 11.3

P. Fonseca

13:50

MapleSim is modelica based.

If I understand correctly, you can develop simple modelica models with plain Mathematica.

For complex stuff, you need a modelica interface.

If I understood correctly, you can use any modelica model (coming from any software) in Mathematica. Not sure if there will be missing pointers eventually used to facilitate the interaction between the model and Mathematica

Simulink is well implemented, but in no way substitute of Modelica. I do know a lot of companies that use Modelica, on all type of businesses (it is a multi-domain simulation language...)

I'm personlly happy with some of the additions. Would have prioritized others, but I'm happy anyway. And since I would want other additions that were not listed/mentioned on this chat past messages, I guess that we can't all be happy...

Searke

14:39

@yode I can't reproduce that problem. Maybe try restarting, clearing stuff out of $UserBaseDirectory? Try a different EntityList call.

yode

@Searke You can you can get the normal result in 11.3?

Searke

Yes.

It looks like EntityList just isn't evaluating at all. Does its documentation examples work?

Ali Hashmi

16:04

Any gentleman here wants to have a take on it:

quora.com/…

personally reading the answers i am not satisfied with the contexts being presented

JimB

16:40

@AliHashmi gentleman?? We're not all that gentle and it is the 21st century. ;)

Jacccy

Hi everybody!
How can I evaluate a list containing values AND functions to create a new list with the result?
I have:
ListOfValuesAndFunctions = {0, 0, 0, 2^t, 2^t, 0, 0, 0, 2^t, 2^t, 2^t};
TValues = Range[1, Length[ListOfValuesAndFunctions]];
ListOfValuesAndFunctions[TValues] does not work =(

The outcome should look like:
{0, 0, 0, 16, 32, 0, 0, 0, 512, 1024, 2048}

JimB

16:57

@Jacccy If the pattern of `ListOfValuesAndFunctions` were characterized as `{0,0,0,1,1,0,0,0,1,1,1}` then maybe something like f[v_] := v 2^Range[1, Length[v]]
f[{0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1}]

Jacccy

Thank you! I see the but I am currently not able to transform it to
{0,0,0,1,1,0,0,0,1,1,1}

I tried:
f[x_] := (If[x == 0, 0, 1])
BitsOfList = f /@ ListOfValuesAndFunctions

The outcome is unfortunatly
{0, 0, 0, If[2^t == 0, 0, 1], If[2^t == 0, 0, 1], 0, 0, 0,
If[2^t == 0, 0, 1], If[2^t == 0, 0, 1], If[2^t == 0, 0, 1]}

JimB

How about `ListOfValuesAndFunctions 2^
Range[1, Length[ListOfValuesAndFunctions]] /. t -> 0` ?

Jacccy

17:14

@JimB Wow, really great!!! Thank you! Now I have to understand your code, such a tiny line with so much input ;)

Szabolcs

17:42

0

Q: In what way can M11.3's system modelling features by used by those who don't have SystemModeler?

Mathematica 11.3 includes some functionality from SystemModeler, but not the full SystemModeler environment. I assume that most people here are familiar with Mathematica, but not SystemModeler, or Modelica, therefore they will find this question relevant. My question is: What practical use do...

"What can I do with my new toy?"

b3m2a1

19:36

@Szabolcs I take what I said earlier back. This alone makes 11.3 a big deal. I've never had the tools available to that type of modeling before but I'm excited to try it out. I used to be a huge SketchUp user this type of object-oriented modeling feels somehow familiar.

Transcript for