xinit | Admin tool to manage an XWiki/Tomcat instance | Application Framework library

I am attempting to use some of the functions in MATLAB to numerically solve a pair of coupled second order ODEs of the form

\ddot{x} = f(x,y,\dot{x},\dot{y})

\ddot{y} = f(x,y,\dot{x},\dot{y}).

I am able to get it to work with just one second-order ODE, but the code I am trying to does not work for a pair of ODEs.

The function odeToVectorField effectively takes a second order ODE and writes it as a vector for a pair of coupled first order ODEs. ode45 is the usual Runge-Kutta solution method. xInit and yInit correspond to the initial conditions for x and y and the aim is then to plot both x and y against time over a certain interval of time.

I have a problem with Chromium running headless on Raspberry Pi model 4B with Ubuntu 20. For showing the browser, I am using the official Raspberry Pi touchscreen.

The problem is that the locally hosted page doesn't load and it says "Page unresponsive". But, if I press the "Exit page" button and then "Reload" button, it starts to work correctly.

I am using the following command to start Chromium: xinit /usr/bin/sh -c "chromium-browser --kiosk 127.0.0.1:5000". If I run the same command, but use firefox instead of chromium-browser, the page works. I don't want to use Firefox, because it has some other problems in headless mode. This is why I am concluding, that the problem is not with the webpage, but with chromium.

I tried hosting the webpage with both npm run serve and python3 -m http.server 5000 but always got the same problem.

I don't know if that matters, but I get the following error message when running the chromium-browser with the above mentioned command:

I am trying to use Address Sanitizer, but the kernel keeps killing my process due to excessive memory usage. Without Address Sanitizer the process runs just fine.

The program is compiled for arm-v7a using gcc-8.2.1 with

I am trying to solve a MINLP problem using first the IPOPT solver to get an initial solution then the APOPT to get the mixed integer solution. However, I get the following error when calling the APOPT solver:

Error: Exception: Access Violation At line 359 of file ./f90/cqp.f90 Traceback: not available, compile with -ftrace=frame or -ftrace=full Error: 'results.json' not found. Check above for additional error details Traceback (most recent call last): File "optimisation_stack.py", line 244, in Optimise_G(t,ob, jofbuses, q, qc, s, oa, k, l, T, G_previous, C, Y, G_previous, G_max, G_min) File "optimisation_stack.py", line 134, in Optimise_G sol = MINLP(xinit, A, B, A_eq, B_eq, LB ,UB, t, ob, jofbuses, q, qc, s, oa, k, l, T, G_previous, C, Y, G_previous) File "optimisation_stack.py", line 215, in MINLP m_APOPT.solve(disp = False) File "C:\Users\Zineb\AppData\Local\Programs\Python\Python37\lib\site-packages\gekko\gekko.py", line 2227, in solve self.load_JSON() File "C:\Users\Zineb\AppData\Local\Programs\Python\Python37\lib\site-packages\gekko\gk_post_solve.py", line 13, in load_JSON f = open(os.path.join(self._path,'options.json')) FileNotFoundError: [Errno 2] No such file or directory: 'C:\Users\Zineb\AppData\Local\Temp\tmptdgafg1zgk_model1\options.json'

My code is the following, I tried to simplify it as much as possible :

I am trying to solve a MINLP problem using gekko. My code is the following:

I am trying to solve a MINLP problem using GEKKO. My code is the following:

I am trying to run the code from here https://github.com/vt4a2h/uml-tool and I found myself stuck with this error message:

I'm trying to use pyinstaller to build a python game into a binary file. I had it working, but today I switched to using arcade instead of pygame. I can build this fine locally, but when pyinstaller is building, pyglet throws an exception saying that it can't find the X11 library. I installed xorg before building it, and not it throws an exception just saying that it can't connect to a display server. Here is the full traceback:

I'm try to generate a Lambda Expression to Select a Date Property and a Value Property to generate a Graph on client side.

I've come up with the following code - Which works fine to select the Value Property