# User Portlet

Fred Klingener
Discussions
It's rude to answer your own questions, but here goes anyway. Here are some ways to shear and twist prisms. To follow along, go up, copy, paste and run the regInfo[] function. The purpose is to show ways to build extrusions, skew and twist them. ...
Without knowing anything about the graphics standards you have to work to, and steeped in the study of Tufte, my personal preference would be, FWIW: Plot[{B1@z, B2@z, B3@z, B4@z, B5@z, B6@z}, {z, -0.3, 0.3}, PlotStyle ->...
The package quaternion Norm[] isn't right either. I'm using a mobile browser, so I don't dare try to format an example, but it's easily checked. Sorry. Fred
A good idea to check the temperature/cpu clock. Alas, the problem evidently can't be fixed with a couple of heat sinks and a fan. I installed a power monitor on the USB power cord, the Raspberry Pi's temperature monitor and the CPU clock monitor...
Thanks, Alex. Until fairly recently, the VideoCore was closed source. Now, though, I see google rumblings that it's being documented and/or hacked, and there are people patching assemblers together for special purposes. ...
My 2016-03-08 sudo apt-get install wolfram-engine got me an installation in which trying to launch Mathematica from the RPi GUI got me an error box with a message, complaining about an invalid file ...
How does socket get associated with 192.168.1.95:54388? socket is instanced on Port 10552, but what does that have to do with anything? Thanks for any hint to get me started. Fred
Here is what worked. In the Pi Test notebook, I set the Evaluation>Notebook's Kernel to Local, then $MachineName "lapstation4" Options[$FrontEnd, EvaluatorNames] {EvaluatorNames -> {"Local" ->...
Thanks for the reply. I evidently mistyped the command in the message above, but I can report progress. I did a full clean reformat of my SD card, loaded a fresh copy of NOOBS onto it, booted the RPI, installed Raspian, sudo apt-get update, sudo...
Sorry about this, but I just can't get the Community editor to do anything sensible. I tried to respond to David Reiss' post, but my message text was deleted and the text of the original post was substituted. I tried to edit my message to blank it...