I've been using MAXIMA CAS for a while now and I've recently ran into a problem. When I open MAXIMA the input line now begins with an upside question mark and the spacebar won't work either has anyone ever had this problem?
Related
I have written an add-on for Google Sheets that contains some custom functions. This has been working fine for months, but suddenly today it started have problems for some spreadsheets. The problem we're seeing is that the custom functions are not running at all, they just show Loading... forever.
I've done a lot of we searching, but none of the suggestions have helped in this case. I've also tried a lot of investigation and the most notable point I've found is that it seems these functions are not running at all. I'm determining that by looking at the Apps Script Execution Logs. For the cases when the functions works I see these custom functions in the log as Completed, but for the cases when it does not there is no log entry at all (no error or anything).
I should clarify that the problem seems to be spreadsheet related. That is, the functions work fine in some spreadsheet, but don't work in others. Also, my add on exposes multiple custom functions, and when this problem is happening it happens for all of the functions.
Furthermore, I've seen that this problem sometimes happens in a freshly created empty spreadsheet, but other times it is fine.
As I mentioned above, everything has been working fine for months, so I don't think it is a bug with my functions.
Is anyone else seeing problems like this? Does anyone have suggestions on how to investigate further? Any other ideas?
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Working from the tutorials I wanted to try PID-controlling a second order linear system. I'm running into segfaults when simulating the closed loop. I've put my code over on Gist. It is mostly identical to the example in the dynamical systems tutorial.
Here's what works
Simulating a diagram containing only the second order system
Dropping in PendulumPlant for the second order system and using the controller
Every step up to simulator.AdvanceTo - that's where the segfault occurs
I'm sure I am missing something obvious here. Does anyone with more experience see what's wrong?
Thanks for reporting this. I didn't see anything on quick inspection. I ran your code (both on linux and mac) and was able to reproduce. Absolutely you should never see a silent segfault, so this is a real issue.
I've escalated it here: https://github.com/RobotLocomotion/drake/issues/12497
FTR - I've also opened a PR to improve the PidController documentation. https://github.com/robotlocomotion/drake/pull/12496
I'm investigating this now -- I've also successfully reproduced the bug locally using the provided python, but I've also reproduced it directly in C++. [Reproduced in now defunct branch]
I'll update when I have something concrete.
Update 1: You've got an algebraic loop in these two systems (one that does not exist for the PendulumPlant as its derivatives and output are expressed in terms of its state and not its inputs). In this case, both systems' outputs depend directly on their inputs so, kablooie! The bug, in this case, is figuring out why that isn't communicated to you right up front.
Presumably, you'd also like to know what the right version of this program is that doesn't have an algebraic loop. Stay tuned.
Final update
A patch has gone through to correct the underlying bug. Depending on how you're accessing Drake, it's immediately available in master, or you can wait for the next binary (as to your taste).
Thanks for bringing this issue to our attention.
Is there a way to prevent the default OS behavior for a command key (i.e. prevent start menu opening and focus loss when the windows key is pressed) using Love2d (LÖVE) in particular, or Lua more generally. If I understand correctly, LÖVE uses LuaJIT, so it would be helpful if a Lua based approach did not involve Lua 5.2/5.3 functions that are not implemented in LuaJIT, but I could rebuild with the appropriate module or shim the LÖVE interpreter if necessary.
Having failed to find a simple solution on my own, I'm currently thinking I will have to create a Lua-C Module. If that is the case, any advice/links along those lines would be greatly appreciated. Thanks!
Lua certainly has no functionality for hijacking OS key functionality of this kind. Such things are too OS-specific for Lua to expose. And from its documentation, Love2D has no such functionality either.
While we're on the subject:
prevent start menu opening and focus loss when the windows key is pressed
It would be exceedingly rude to have your application prevent basic OS functionality like this from working. However good your game may be, it is not as important as the user being able to do what they actually want. If the user wants to switch to something else, that's their right, and you should not interfere. If the user accidentally pressed that button, that's their responsibility.
The only thing you should do is set up a love.focus callback, so that when the application loses focus you can automatically pause.
I programmed with DirectX 9 / OpenGL and C++ some years ago and I wanted to start a new hobby project with SharpDX and DirectX 11. I made the first basic steps and everything looks nice, but I only the opened my application and saw, that everything's as expected and closed them afterwards.
Today, my application was opened for about 20 seconds and suddenly my whole window content disappeared. I checked the official SharpDX samples and I had the same problem with the official MiniTri sample from SharpDX. Finally, I tested the offical samples from Microsoft in Microsoft DirectX SDK (June 2010)'s Direct3D11 Tutorial 02, which does nothing more than showing a colored triangle. Even the official sample from Microsoft (which does neither use SharpDX nor C#) has the same issue on my computer. Of course, I used my favored search engine for quite some time, but I was not able to find anyone with the same issue. Maybe I searched for the wrong keywords.
After around 14-20 seconds, the content (i.e. vertices) of the window disappear. I have no rotation, animation, movement or anything, just simple triangles with a simple color.
I'd be very happy, if you can help me!
I spent several hours to figure out, why some simple official SharpDX and DirectX tutorials do not work correctly on my machine. Finally, I decided to ignore that issue and contine with the development of my game. It was a great decision since it turned out, that I don't have any issue with the advanced tutorials! The MultiCube sample from SharpDX worked very well and its content did not disappear. So, I figured out that my problem does not occur, if my graphics card is kept busy. I continued my development while running Fallout 4 minimized in the background. Developing this way, my content did not disappear.
I started to implement a user interface for my game using Direct2D1 (with SharpDX). It turned out that using Direct2D1 solves my issue and the content stopped to disappear.
I am not absolutely sure what caused my issue, but apparently my GPU got bored and stopped rendering my simple primitives. :-D Using Direct2D1 for UI solves this problem anyhow.
I'm looking to print reports from a rails 4 web app to a dot matrix printer.
I tried exporting to a text file and printing it, but no luck.. i.e. it did not look, feel and behave the same.
The rationale for doing this is printing large reports quickly using existing infrastructure that the client has.
Appreciate any help I can get......
Thanks!