I was playing with Mathematica on the Raspberry and noticed this:

Limit[(x y^2)/(x^2 + y^4), {x, y} -> {0, 0}] leads to "General::ivar: {x,y} is not a valid variable."

While on Wolfram Cloud:

Limit[(x y^2)/(x^2 + y^4), {x, y} -> {0, 0}] leads to "Indeterminate"

On the Raspberry it looks like Mathematica is complaining about a syntax problem, but the same syntax works on the Wolfram Cloud. Why is that?

I'm using version 11.0.1, that might be the problem. Thanks !!

tryiing sudo apt-get update --fix-missing now, maybe this will help

For the TextRecognize issue, please see this post.

I tried PacletSiteUpdate /@ PacletSites[];
PacletInstall["TesseractTools"] now change, still "Failed to load TesseractTools.

I read that Post again and see that maybe "...you may have to install a paclet manually first..." does not mean that Paclet Installation can be done without upgrading to the not yet official 11.2.0 version?

Does it mean that I shall again spend several hours by the terribly slow updating process for v.11 to v.11.2? (Yesterday it took roughly 7 hours to upgrade fro v.10 to version 11.)

Hello developers, I think I've found another little bug/problem (?) in Mma 11.2:

'Just for fun' / to see what happens I played around in its options (Format -> Option Inspector)...I tried what will happen if change the FrontEndStackSize (Global Options -> System Configuration) to 131072 and furthermore I changed 'Background' (Notebook Options -> Display Options) to a slightly dark grey instead of standard white.

After a restart my background is now a slightly grey, this is good - but now I can't change it anymore. If I now try to change it the same way again, it always jumps back to the same grey, whatever color I choose there. Also the FrontEndStackSize jumped back to 262144 and is greyed out now, I can't change it anymore (but why was I able to edit it at my first tryout?

Furthermore it seems it has no effect if I click inside the notebook on Format -> Background Color and change something there. When should it take effect, immediately? When I open a new notebook? But it changes nothing and when I open a new notebook, nothing is marked in these options anymore...a bit odd. But I did not watched these things in previous versions so I do not know if that is new or all the time working this way.

Hello, I upgraded Wolfram on Raspberry pi 3.

mexmat:~# ll /opt/Wolfram/WolframEngine/11.2/ total 16 drwxr-xr-x 6 root root 4096 Feb 15 18:12 AddOns drwxr-xr-x 3 root root 4096 Feb 15 18:13 Configuration drwxr-xr-x 2 root root 4096 Feb 15 18:20 Executables drwxr-xr-x 19 root root 4096 Feb 15 18:19 SystemFiles

But when I try to run both Wolfram/Mathematica, I am asked for activation key or password. Copyright 1988-2018 Wolfram Research, Inc. Mathematica cannot find a valid password. For automatic Web Activation enter your activation key (enter return to skip Web Activation): You will need to get a password from your license certificate or from Wolfram Research (http://register.wolfram.com). Machine name: mexmat MathID: 4701-27310-17972 You will need a valid activation key and password in order to proceed. Go to http://user.wolfram.com to register your activation key and obtain the password. Enter your Activation key Enter your password: The password you entered is not valid. Please press Enter to quit.

Where can I get activation key?

You're right :) Thats awesome, many many thanks

Just for my interest, will the Raspberry get further updates of Mathematica in near future possibly?

Version 11.2.0 for the Raspberry Pi was released a couple of days ago.

Try updating the paclet indices first:

PacletSiteUpdate /@ PacletSites[];

PacletFindRemote["MRAALink"]

should be version 1.0.5.

Thanks- I'm going to try the download.

Thanks to all for your help.

Carl

The upgrade from Wheezy to Jessie is quite straight forward if you want to just reinstall Raspbian, as the default NOOBS download already comes with Mathematica 11 + Raspbian Jessie : https://www.raspberrypi.org/downloads/noobs/

You can find information on how to install the download on your own SD card here : https://www.raspberrypi.org/learning/software-guide/

I'm not sure what vendors have updated their SD cards that come pre-loaded with NOOBS to have Jessie + 11, but most should have at least Jessie, which allows you to then run the above commands to upgrade Mathematica.

Thanks,

Ian

This most likely means you are running Raspbian Wheezy, for which the latest wolfram-engine package available is indeed 10.0.2+2015020304.

All later versions, as listed in

https://archive.raspberrypi.org/debian/pool/main/w/wolfram-engine/

require Raspbian Jessie.

Hi,

Did you do just sudo apt-get upgrade? If you already have it installed, you will need to perform the wolfram engine upgrade directly like so :

sudo apt-get update && sudo apt-get upgrade wolfram-engine

Thanks

Ian

What is the output of

ls /opt/Wolfram/WolframEngine

?

I don't think this should happen, but it's possible you have both versions installed. Alternatively you can try removing mathematica and reinstalling it completely with:

sudo apt-get update && sudo apt-get remove -y wolfram-engine && sudo apt-get install wolfram-engine

This will not delete any notebooks you may have created or any data you may have from using Mathematica inside ~/.WolframEngine or ~/.Wolfram Research

Thanks,

Ian

Hi, we have updated MRAALink on the paclet servers.

You can update the paclet with :

PacletUpdate["MRAALink"]

and then restart the kernel and this should resolve your issue.

Thanks,

Ian

I'm running 4.4.5. Should I use a previous one?

Hi,

Were you able to fix the issue with the MRAA library initialization. I can't open the camera or get any of the sense hat sensor data with 11.01.

I tested camera and sense hat with Python, and they work just fine.

Just tried with a clean install with Raspbian from rpi.org and still crashes. Can you help me with this? Thanks

I tested Mma 11.0.1 / Wolfram 11.01 today on a Raspberry Pi 3 Model B and had major troubles with the GPIO functions (FindDevices, DeviceConfigure etc.). I am getting errors like these:

LibraryFunction::initerr: A nonzero error code 6 was returned during the initialization of the library /opt/Wolfram/WolframEngine/11.0/SystemFiles/Components/MRAALink/LibraryResources/Linux-ARM/MRAALink.so.

LibraryFunction::libload: The function GetPlatform was not loaded from the file /opt/Wolfram/WolframEngine/11.0/SystemFiles/Components/MRAALink/LibraryResources/Linux-ARM/MRAALink.so.

LibraryFunction::initerr: A nonzero error code 6 was returned during the initialization of the library /opt/Wolfram/WolframEngine/11.0/SystemFiles/Components/MRAALink/LibraryResources/Linux-ARM/MRAALink.so.

LibraryFunction::libload: The function InitializePin was not loaded from the file /opt/Wolfram/WolframEngine/11.0/SystemFiles/Components/MRAALink/LibraryResources/Linux-ARM/MRAALink.so.

LibraryFunction::initerr: A nonzero error code 6 was returned during the initialization of the library /opt/Wolfram/WolframEngine/11.0/SystemFiles/Components/MRAALink/LibraryResources/Linux-ARM/MRAALink.so.

I had previously used MMa 10 on the same hardware and it worked fine.

Wolfram Language 11.0.1 Engine for Linux ARM (32-bit) Copyright 1988-2017 Wolfram Research, Inc.

In[1]:= PacletInformation["MRAALink"]                                                                                                                     

Out[1]= {Name -> MRAALink, Version -> 1.0.2, BuildNumber -> , Qualifier -> , WolframVersion -> 10+, SystemID -> All, Description -> , Category -> , 

>    Creator -> , Publisher -> , Support -> , Internal -> False, Location -> /opt/Wolfram/WolframEngine/11.0/SystemFiles/Components/MRAALink, 

>    Context -> {MRAALink`}, Enabled -> True, Loading -> Manual}

In[2]:= SystemInformation["Small"]                                                                                                                        

Out[2]= {Kernel -> {SystemID -> Linux-ARM, ReleaseID -> 11.0.1.0 (2017031701, 2017011701), 

>      CreationDate -> DateObject[{2017, 1, 17}, TimeObject[{12, 45, 19.}, TimeZone -> 2.], TimeZone -> 2.]}, FrontEnd -> Missing[NotActive]}

I have a totally up-to-date Raspbian installation. But perhaps I am too up-to-date with kernel 4.9 running (from rpi-update). I'll test if this is the reason.

Thanks for your reply,

Michael

Thanks for the information! I'm glad you got it working again.

From the looks of your situation, there's likely a problem with the GPIO library we use, MRAA, and the 4.9 linux kernel. We will get to work fixing this.

Ian

Thanks Michael for your discover! The downgrade let Mathematica access to gpio on my RPi

Hello,

The Documentation Center is not shipped with the Raspberry Pi release of the Wolfram Language, so you will need to use the online version of the Documentation Center online at : reference.wolfram.com.

Ian