doublependulum | simple double pendulum made in python | Machine Learning library

by lduck11007 Python Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(4)Vulnerabilities Install Support

kandi X-RAY | doublependulum Summary

doublependulum is a Python library typically used in Artificial Intelligence, Machine Learning, Tensorflow, Numpy applications. doublependulum has no bugs, it has no vulnerabilities and it has low support. However doublependulum build file is not available. You can download it from GitHub.

simple double pendulum made in python. Change starting angles, weights and lengths by modifying lines 7 through to 16. credit to encukou for the python implementation of the bresenham algorithm that made this a lot easier. This project took the equations mostly from here:

Support

Quality

Security

License

Reuse

Support

doublependulum has a low active ecosystem.

It has 14 star(s) with 1 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

doublependulum has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of doublependulum is current.

Quality

doublependulum has no bugs reported.

Security

doublependulum has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

doublependulum does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

doublependulum releases are not available. You will need to build from source code and install.

doublependulum has no build file. You will be need to create the build yourself to build the component from source.

Top functions reviewed by kandi - BETA

kandi's functional review helps you automatically verify the functionalities of the libraries and avoid rework.
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of doublependulum

Get all kandi verified functions for this library.

doublependulum Key Features

No Key Features are available at this moment for doublependulum.

doublependulum Examples and Code Snippets

No Code Snippets are available at this moment for doublependulum.

Community Discussions

Trending Discussions on doublependulum

p5.js sketch very slow on mobile devices

D3.js double pendulum odd behavior

How are you supposed to use a controller with a URDF

name 'cc_library' is not defined

QUESTION

p5.js sketch very slow on mobile devices

Asked 2021-Feb-25 at 06:46

I'm building a creative simulation in p5.js by employing double pendula. Here is the link to the stripped-down version of the code (I'm not sure it can be made smaller): https://github.com/amzon-ex/amzon-ex.github.io/tree/master/dp-sketch-stripped

Here is where you can see the animation: https://amzon-ex.github.io/dp-sketch-stripped/dp-sketch.html

When I run this on my laptop (Windows 10, MS Edge 88) I get about 55-60 fps, which is what I want. However, when I run the same sketch on a mobile device (Android, Chrome 88) the performance is very poor and I hardly get 5-6 fps. I do not understand what is complicated about my code that contributes to such a poor performance. I have ran other kinds of p5.js sketches before on mobile and they've worked well.

Any insight is appreciated.

Since I have a few files in the project link I provided, here's a quick guide (there is absolutely no need to read everything):

sketch.js is the key file, which builds the animation. It takes an image, builds an array filled with brightness values from the image (array lumamap, in setup()). Then I draw trails for my pendula where the brightness of the trail at any pixel corresponds to the brightness value in lumamap.
dp-sketch.html is the HTML container for the p5 sketch.
libs/classydp.js houses the DoublePendulum class which describes a double pendulum object.

...

ANSWER

Answered 2021-Feb-25 at 06:46

As I've found out with some help, the issue is tied to varying pixel density on different devices. As mobile devices have higher pixel density compared to desktops/laptops, my 500x500 canvas becomes much bigger on those displays, hence leading to many more pixels to render. Coupled with the fact that mobile processors are weaker in comparison to desktop processors, the lag/low framerate is expected.

This can be avoided by setting pixelDensity(1) in setup(); which avoids rendering larger canvases on dense-pixel devices.

Source https://stackoverflow.com/questions/66311293

QUESTION

D3.js double pendulum odd behavior

Asked 2021-Jan-03 at 18:21

I'm using D3.js to make a double pendulum simulator. I'm using 4th order Runge-Kutta to integrate the ODE's and I'm pretty sure I'm getting the correct values for theta and phi as I checked the output data with mathamatica. However the length of second pendulum keeps changing as it moves which should not be occurring and the path traced out by the pendulum doesn't seem correct either. Since I'm almost certain I am getting the correct values for phi and theta from the integration I think the issue may be how I calculate the x and y coordinates but I'm not sure.

...

ANSWER

Answered 2021-Jan-03 at 18:21

You are correct, you aren't calculating the x,y positions correctly, more specifically, you are not calculating x correctly:

Source https://stackoverflow.com/questions/65552591

QUESTION

How are you supposed to use a controller with a URDF

Asked 2020-Dec-27 at 23:59

I'm trying to use the LQR Controller to move the wheels on this really simple URDF linked here

I'm trying to understand how to use the LQR controller for a model loaded from a URDF so this is a mix of the LQR example and the PR2 Example

...

ANSWER

Answered 2020-Dec-27 at 23:59

There are a few problems here. The first, and the one generating the error, is the fact that you've passed a plant_context (only) into the LinearQuadraticRegulator. Because your system has collision geometry, you need a SceneGraph to be connected for the dynamics to be evaluated. You would want to pass the diagram containing both the MultibodyPlant and the SceneGraph into the LQR call.

But the real problem is going to be deeper than that. LQR is not going to work out of the box for you on this model. That's not a Drake issue, it's a math issue. The system you've described not only has collision dynamics, but also is not going to be controllable in the linearization. When people use LQR to stabilizing wheeled robots, they do it in a minimal coordinates which assumes that the wheels are attached to the ground at a point. In drake, that would mean writing your own LeafSystem with the vehicle dynamics.

Source https://stackoverflow.com/questions/65471497

QUESTION

name 'cc_library' is not defined

Asked 2020-Oct-05 at 06:51

Trying to build a C++ library in C++ and I've successfully confused myself

tools/vector_gen.bzl

...

ANSWER

Answered 2020-Oct-05 at 06:51

Inside a .bzl file the builtin definitions need to be qualified as native.cc_library

Source https://stackoverflow.com/questions/64201175

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install doublependulum

You can download it from GitHub.
You can use doublependulum like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

Find more information at: