FEC | FEC code such as RDP , RS , EVENODD , STAR
kandi X-RAY | FEC Summary
kandi X-RAY | FEC Summary
Some FEC(Forward Error Correction) codes such as RDP, Reed Solomon (P+Q), EVENODD, STAR for fault-tolerant in network communication and other conditions. There are several known algorithms that protect data against two or more disk failures in an array of disks. Among these are EVENODD, Reed Solomon (P+Q) erasure codes, DATUM, RDP and STAR. RDP is most similar to EVENODD. Both EVENODD/RDP and Reed-Solomon P+Q encoding compute normal row parity for one parity disk. However, they employ different techniques for encoding the second disk of redundant data. Both use exclusive-or operations, but Reed-Solomon encoding is much more computationally intensive than EVENODD and RDP. RDP shares many of the properties of EVENODD and Reed-Solomon encoding, in that it stores its redundant data(parity) separately on just two disks, and that data is stored in the clear on the other disks. Among the previously reported algorithms, EVENODD has the lowest computational cost for protection against two disk failures. RDP improves upon EVENODD by further reducing the computational complexity. The complexity of RDP is provably optimal, both during construction and reconstruction. I using some FEC codes such as RDP, Reed Solomon and STAR with UDP protocol and ARQ in remote mirroring system to protect data against loss in WAN. And I did losts of testing to test this new scheme. Experimental result shows me that when packet loss probability between 0.001 and 0.1, the new scheme has better transmission performance and higher throughput than a system with TCP protocol. So, I want to contribute these FEC codes. Because of there algorithms are too complex, so it's too hard to find them on the net.
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Top functions reviewed by kandi - BETA
- Entry point for testing
- The RDP decoding
- The rdp decoding
- The decoding process
- Main entry point for the star
- Starts the decoding process
- Perform odd decoding
- Performs an oddodd decoding
- Prints the star
- Synchronized
- Performs an odd number decoding
- Perform an odd reduction
- Main method for testing
- RDP decoding
- Perform rdp decoding
- The decoding routine
- Test program
- Runs the transformation
- Invert a matrix
- Generate the QR encoding
- Computes the multiplication of two columns
- Gets a single multiplication
- Generate Galois field
- Set the data
- Set the data
FEC Key Features
FEC Examples and Code Snippets
Community Discussions
Trending Discussions on FEC
QUESTION
I'm trying to trace someone's code and I've encountered a section that I'm a little confused about. Firstly the file from the github repo I'm looking at is https://github.com/tahoe-lafs/zfec/blob/master/zfec/easyfec.py. But I'll paste the part that I'm confused about below. I have 2 questions. Firstly,
From easyfec.py
ANSWER
Answered 2021-May-07 at 16:21Looking closely at init.py, Encoder and Decoder appear to be imported from a _fec module that you have to build yourself with the provided setup script.
The following line:
QUESTION
I try to resolve to do an update when the pk fails on an insert in pg12. I think, it's easy, just an on conflict in the query... but no. When I run the query, I got this error:
...ANSWER
Answered 2021-Apr-23 at 14:19EXCLUDED always refers to the column names of the target table not the source. You also can't use the target table name on the left side of the assignment.
So you need
QUESTION
I'm new to python (and posting on SO), and I'm trying to use some code I wrote that worked in another similar context to import data from a file into a MySQL table. To do that, I need to convert it to a dataframe. In this particular instance I'm using Federal Election Comission data that is pipe-delimited (It's the "Committee Master" data here). It looks like this.
C00000059|HALLMARK CARDS PAC|SARAH MOE|2501 MCGEE|MD #500|KANSAS CITY|MO|64108|U|Q|UNK|M|C|| C00000422|AMERICAN MEDICAL ASSOCIATION POLITICAL ACTION COMMITTEE|WALKER, KEVIN MR.|25 MASSACHUSETTS AVE, NW|SUITE 600|WASHINGTON|DC|200017400|B|Q||M|M|ALABAMA MEDICAL PAC| C00000489|D R I V E POLITICAL FUND CHAPTER 886|JERRY SIMS JR|3528 W RENO||OKLAHOMA CITY|OK|73107|U|N||Q|L|| C00000547|KANSAS MEDICAL SOCIETY POLITICAL ACTION COMMITTEE|JERRY SLAUGHTER|623 SW 10TH AVE||TOPEKA|KS|666121627|U|Q|UNK|Q|M|KANSAS MEDICAL SOCIETY| C00000729|AMERICAN DENTAL ASSOCIATION POLITICAL ACTION COMMITTEE|DI VINCENZO, GIORGIO T. DR.|1111 14TH STREET, NW|SUITE 1100|WASHINGTON|DC|200055627|B|Q|UNK|M|M|INDIANA DENTAL PAC|
When I run this code, all of the records come back "NaN."
...ANSWER
Answered 2021-Apr-15 at 13:40Try this, worked for me:
QUESTION
In my WPF application I have a window that loads an html string to show to the user. Then there is a Button that let the user open the printing dialog and print the document (using the javascript code window.print();).
The problem is: if the html document contains an embedded pdf (
Here it is the same code in a sample application to reproduce the problem (comment the call to GetHtmlWithEmbeddedPdf to see the dialog working, and decomment it to see the error).
The Window:
...ANSWER
Answered 2021-Mar-30 at 11:18This is a security feature, not a bug. It's also not limited to WebView2 but applies to Chromium in general.
The embedded PDF object is causing the HTML document to be sandboxed. Thus preventing window.print() from executing as usual.
This is as specified by the HTML specification:
The printing steps for a Document document are:
- ...
- If the active sandboxing flag set of document has the sandboxed modals flag set, then return.
This is also why Ctrl+P still works and brings up the print dialog, as it is a user action not affected by this security issue.
WorkaroundUntil WebView2 "natively" supports printing, the best workaround I can currently think of is to load the PDF inside an iframe, thus freeing the parent document from being sandboxed:
QUESTION
I have a Layout component, which has a Table component, with a component Entry for each row.
Each row can be selected, so later with a button I can send all the entries to a REST service, so each time a row is selected I add it to my state.
But each time the state changes, my Layout component renders, rendering each entry of the table, that makes me lost lots of performance and time.
Is there a way to avoid rerendering the component? I'm trying to avoid using class components.
This function triggers the rendering...
...ANSWER
Answered 2021-Mar-27 at 09:15If you wrap RACheckEntry in React.memo (RACheckEntry =React.memo((props) => {..})) React will only re-render it when props change, however one of you props is a method checkboxHandler, I don't see where you define it, but if it is defined inside a functional component, it'll be re-created on each render, making memo useless. To avoid this problem React provides useCallback hook, if you define your handler with it it'll stay the same between renders (const checkboxHandler= useCallback(() => { ...},[]).
Someone had a similar problem with a different table and it seems it work for them react-table is extremely slow with react-select: how to speed it up?
Update: move all manipulations with state inside setSelectedChecks callback, so you don't depend on the current state inside checkBoxHandler
QUESTION
I am developing a code for transmission and reception of a txt file using fec correction and qam modulation. The main problem is in transmission it only send one character or nothing just for a second and then get freeze. It's the first time that i used GNU radio and i don't know what caused this problem can you check the code in the images below and tell me what it could be and how to solve this. If i am doing something wrong please tell me.
Sorry, I don't have the range to post images so instead that I posted links.
...ANSWER
Answered 2021-Mar-22 at 21:42You're using an outdated version of GNU Radio, and within that, you're using the explicitly deprecated Packet Encoder, which randomly drops data. Don't do that, you had to pick that block from a category called "Deprecated" for a reason.
Also, it looks like you're using Throttle together with hardware. That doesn't work, and GRC also explicitly tells you it's a bad idea – you should pay attention to the console output in the lower left, it contains useful information!
So, don't start a new project on GNU Radio 3.7; GNU Radio 3.8 or 3.9 is trivial to install from Linux distro sources on any modern Linux Distro, and on Windows, you can use the excellent anaconda installer method.
Afterwards, orient on the examples that come with GNU Radio (installed, typically, under /usr/share/gnuradio/examples) in the digital subfolder. packet_loopback and other files will be good examples to learn from!
Other than that, make sure you've clicked on the "Get Started" button on gnuradio.org, and followed the tutorials up to the point of the PSK transmission tutorial. This should be a good entry to exactly what you're doing.
QUESTION
I'm using vim with w0rp/ale (aka dense-analysis/ale) and have been for several years. It suddenly stopped working and I can't figure out why. It will neither lint nor fix.
ALEInfo shows what appear to be normal values, but there are no commands in the Command History.
If I run the command eslint -f unix --stdin --stdin-filename src/App.js < src/App.js I get back the expected eslint errors (two of them).
(Updated) NOTE, however, that ALECodeAction returns No active LSPs
I've tried removing my .eslintrc.json in case it has errors (no luck) and tried simplifying / trying new combinations of g:ale_linters in case that was the issue, but no love there either.
Any suggestions for some trouble-shooting approaches?
Here's the various configurations I've tried in my .vimrc:
...ANSWER
Answered 2021-Jan-18 at 18:49OMG: I don't know what happened, but it's working again! Maybe once before I've had this kind of issue with ALE, so I tried a number of things over a period of serval hours (ALE is fundamental to my work flow) none of which seemed to help:
- Reinstall ALE
- Reinstall stylelint, eslint including
npx eslint --initto start clean - Try prettier
- Making many changes to the configuration/settings, including stripping all but the most fundamental pugins.
- Try different filetype settings
- aliasing/not aliasing eslint
- git bisect around recent changes
- rebooting my machine
And t*esting after each change.
I finally hit on a solution: sad to say I don't know why this was a problem in the first place nor why this fixed it, but here it is.
This morning, I tried installing an LSP, just for grins: typescript-language-server. This didn't help, but when I uninstalled it and tried ALEInfo again, now it's working!
QUESTION
I have some React-Redux-Typescript code, and I am getting results from an API and trying to create interfaces for the response objects. Here I have my Example data:
...ANSWER
Answered 2021-Jan-16 at 21:32The type you've specified for feature is a tuple - a fixed length array whose elements have known types. The following is what you want:
QUESTION
I am attempting to download a .zip file from https://www.fec.gov/data/browse-data/?tab=bulk-data specifically https://www.fec.gov/files/bulk-downloads/2020/indiv20.zip. Compressed, the file is 2.7 GB. The download is initiated and complete within 10 seconds. When I then try to unzip the file, I receive the error messages below. When downloaded to my local machine, the link downloads as a .zip file and opens to the data requested.
...ANSWER
Answered 2020-Oct-16 at 01:20Check the content of the file. It is probably an error message in html. (cat indiv20.zip)
QUESTION
I'm trying to configure the vim Ale plugin to use Tidy to lint HTML code.
I added to my .vimrc file:
ANSWER
Answered 2020-Oct-08 at 21:18You also need to tell vim where to find the tidy executable, e.g., tidy on Linux, or tidy.exe on Windows.
In my case, I added this to my vimrc:
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Vulnerabilities
No vulnerabilities reported
Install FEC
You can use FEC like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the FEC component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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