42 | Simulation for spacecraft attitude control system analysis and design

by ericstoneking C Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | 42 Summary

42 is a C library typically used in Simulation, Unity applications. 42 has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

42 is a comprehensive general-purpose simulation of spacecraft attitude and orbit dynamics. Its primary purpose is to support design and validation of attitude control systems, from concept studies through integration and test. 42 accurately models multi-body spacecraft attitude dynamics (with rigid and/or flexible bodies), and both two-body and three-body orbital flight regimes, modelling environments from low Earth orbit to throughout the solar system. 42 simulates multiple spacecraft concurrently, facilitating studies of rendezvous, proximity operations, and precision formation flying. It also features visualization of spacecraft attitude.

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Quality

Security

License

Reuse

Support

42 has a low active ecosystem.

It has 180 star(s) with 65 fork(s). There are 31 watchers for this library.

It had no major release in the last 6 months.

There are 24 open issues and 67 have been closed. On average issues are closed in 79 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of 42 is current.

Quality

42 has no bugs reported.

Security

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

License

42 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

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

Installation instructions, examples and code snippets are available.

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42 Key Features

No Key Features are available at this moment for 42.

42 Examples and Code Snippets

No Code Snippets are available at this moment for 42.

Community Discussions

Trending Discussions on 42

Xarray (from grib file) to dataset

Pusher Undefined property: stdClass::$channels in Laravel Lumen

Import compose sample projects to android studio version 4.2

forloop over a function in R

Can different network be the cause for UnreachableBrowserException exception?

Crash on a protocol witness related issue

Using TensorFlow with GPU taking a long time for loading library related to CUDA

Plot dates in Pandas with line connecting their duration

Python round - Two deciding decimals

Increment column value based on value of another column

QUESTION

Xarray (from grib file) to dataset

Asked 2021-Jun-16 at 02:36

I have a grib file containing monthly precipitation and temperature from 1989 to 2018 (extracted from ERA5-Land).

I need to have those data in a dataset format with 6 column : longitude, latitude, ID of the cell/point in the grib file, date, temperature and precipitation.

I first imported the file using cfgrib. Here is what contains the xdata list after importation:

...

ANSWER

Answered 2021-Jun-16 at 02:36

Here is the answer after a bit of trial and error (only putting the result for tp variable but it's similar for t2m)

Source https://stackoverflow.com/questions/67963199

QUESTION

Pusher Undefined property: stdClass::$channels in Laravel Lumen

Asked 2021-Jun-15 at 16:42

I'm making a POC with Lumen and Vue.JS. For now it just has to send a "hello world" message from the Lumen back-end to the Vue.JS front-end (which works). I have made an event which is triggered upon loading the page like this:

...

ANSWER

Answered 2021-Jun-15 at 16:42

Fix composer.json

I have created an issue on the PHP package: https://github.com/pusher/pusher-http-php/issues/295

It is true this version is broken, but the fix should be in the composer.json file. Mine looked like this:

Source https://stackoverflow.com/questions/66624416

QUESTION

Import compose sample projects to android studio version 4.2

Asked 2021-Jun-15 at 15:23

I'm trying to import compose sample projects, but I'm facing this error:

...

ANSWER

Answered 2021-Jun-15 at 15:23

The version 202.7660.26.42.7322048 is

Source https://stackoverflow.com/questions/67447249

QUESTION

forloop over a function in R

Asked 2021-Jun-15 at 14:10

I have a t.test function and I want to loop over myvec <- c("am", "vs"). any help will e appreciated, many thanks in advance.

...

ANSWER

Answered 2021-Jun-15 at 14:10

You can change the function to -

Source https://stackoverflow.com/questions/67970192

QUESTION

Can different network be the cause for UnreachableBrowserException exception?

Asked 2021-Jun-15 at 13:57

I have two grid setup's

Local grid setup (hub and nodes are running in my local machine) and my local machine connected to network#1
VM grid setup (hub and nodes are running in my virtual machine) and my virtual machine connected to network#2

When I execute the scripts I need to pass the IP address as a parameter. Here, I can run my scripts successfully in local machine(code is available in local machine) by passing the network#1 IP address but if I pass the network#2 IP address (VM IP address) to local machine then I am getting below exception,

org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.

As per my knowledge, hub and nodes should be connected to same network. Cannot we run the scripts by passing the VM IP address to local machine?

Trace:

...

ANSWER

Answered 2021-Jun-15 at 13:57

Yes, the exception occurred due to firewall. The ping test is successful from local machine to VM but not from VM to local. I contacted the organization network administrator to confirmed this.

Source https://stackoverflow.com/questions/67836113

QUESTION

Crash on a protocol witness related issue

Asked 2021-Jun-15 at 13:26

In my iOS app "Progression" there is rarely a crash (1 crash in ~1000+ Sessions) I am currently not able to fix. The message is

Progression: protocol witness for TrainingSetSessionManager.update(object:weight:reps:) in conformance TrainingSetSessionDataManager + 40

This crash points me to the following method:

...

ANSWER

Answered 2021-Jun-15 at 13:26

While editing my initial question to add more context as Jay proposed I think it found the issue.

What probably happens? The view where the crash is, contains a table view. Each cell will be configured before being presented. I use a flag which holds the information, if the amount of weight for this cell (it is a strength workout app) has been initially set or is a change. When prepareForReuse is being called, this flag has not been reset. And that now means scrolling through the table view triggers a DB write for each reused cell, that leads to unnecessary writes to the db. Unnecessary, because the exact same number is already saved in the db.

My speculation: Scrolling fast could maybe lead to a race condition (I have read something about that issue with realm) and that maybe causes this weird crash, because there are multiple single writes initiated in a short time.

Solution: I now reset the flag on prepareForReuse to its initial value to prevent this misbehaviour.

The crash only happens when the cell is set up and the described behaviour happens. Therefor I'm quite confident I fixed the issue finally. Let's see. -- I was not able to reproduce the issue, but it also only happens pretty rare.

Source https://stackoverflow.com/questions/67947819

QUESTION

Using TensorFlow with GPU taking a long time for loading library related to CUDA

Asked 2021-Jun-15 at 13:04

Machine Setting:

GPU: GeForce RTX 3060
Driver Version: 460.73.01
CUDA Driver Veresion: 11.2
Tensorflow: tensorflow-gpu 1.14.0
CUDA Runtime Version: 10.0
cudnn: 7.4.1

Note:

CUDA Runtime and cudnn version fits the guide from Tensorflow official documentation.
I've also tried for TensorFlow-gpu = 2.0, still the same problem.

Problem:

I am using Tensorflow for an objection detection task. My situation is that the program will stuck at

2021-06-05 12:16:54.099778: I tensorflow/stream_executor/platform/default/dso_loader.cc:42] Successfully opened dynamic library libcublas.so.10

for several minutes.

And then stuck at next loading process

2021-06-05 12:21:22.212818: I tensorflow/stream_executor/platform/default/dso_loader.cc:42] Successfully opened dynamic library libcudnn.so.7

for even longer time. You may check log.txt for log details.

After waiting for around 30 mins, the program will start to running and WORK WELL.

However, whenever program invoke self.session.run(...), it will load the same two library related to cuda (libcublas and libcudnn) again, which is time-wasted and annoying.

I am confused that where the problem comes from and how to resolve it. Anyone could help?

Discussion Issue on Github

===================================

Update

After @talonmies 's help, the problem was resolved by resetting the environment with correct version matching among GPU, CUDA, cudnn and tensorflow. Now it works smoothly.

...

ANSWER

Answered 2021-Jun-15 at 13:04

Generally, if there are any incompatibility between TF, CUDA and cuDNN version you can observed this behavior.

For GeForce RTX 3060, support starts from CUDA 11.x. Once you upgrade to TF2.4 or TF2.5 your issue will be resolved.

For the benefit of community providing tested built configuration

CUDA Support Matrix

Source https://stackoverflow.com/questions/67847219

QUESTION

Plot dates in Pandas with line connecting their duration

Asked 2021-Jun-15 at 11:35

I have a dataframe that contains two columns with dates astype Timestamps. I would like to plot a figure where the time between those dates is 1 and the time outside those dates is 0: kinda like an 'active on/off' binary situation. I have discretised and indexed the whole day in intervals of 1 minute. After that, I am checking if the index is between time1 and time2, if it is then I am putting 1 to a new column else 0. This works but I think it's an overkill

...

ANSWER

Answered 2021-Jun-15 at 11:35

first make one column for time:

Source https://stackoverflow.com/questions/67983448

QUESTION

Python round - Two deciding decimals

Asked 2021-Jun-15 at 09:36

I want to round numbers so that two numbers are used after the last zero, or decimal if the number is greater than 1. I've looked up the documentation for round, but can't seem to find this feature.

If I use round, it always round to n decimals places regardless.

This is the output I'm looking for:

...

ANSWER

Answered 2021-Jun-15 at 09:30

The kind of rounding you're asking for isn't a common operation.

In terms of common operations you have two cases (ignoring sign since all your examples are positive):

If the value is less than 1, round to significant figures (eg per the link in @quamrana's comment on the question).
Else (ie the value is at least 1), round to decimal places in the usual way.

Your final code would reasonably be a function with a simple if-else:

Source https://stackoverflow.com/questions/67983502

QUESTION

Increment column value based on value of another column

Asked 2021-Jun-15 at 09:36

I have a df as below:

...

ANSWER

Answered 2021-Jun-15 at 08:07

You'll need to use the modulo operator to reset your .cumcount by the value of df["counter"]

Source https://stackoverflow.com/questions/67982095

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

Vulnerabilities

No vulnerabilities reported

Install 42

If you're installing on Windows, see the file "Install-msys.txt" in the Docs folder. The compiler will attempt to detect what platform you're on (Linux, OSX, or Msys), but its success rate isn't great. If you have errors on the first compile or run, try editing your Makefile to manually set your 42PLATFORM.
See the overview, "42 Overview.pdf", in the Docs folder. Also recommended:. The default folder for inputs and outputs is "InOut". Look there for sample input files. "Inp_Sim.txt" is the top-level input file.
Nomenclature.pdf
POV Menu.pdf
Key Bindings.txt
FSW Models.pdf
Flight Regimes.pdf

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 .

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