FEC | FEC code such as RDP , RS , EVENODD , STAR

 by   syzcch Java Version: Current License: No License

kandi X-RAY | FEC Summary

kandi X-RAY | FEC Summary

FEC is a Java library. FEC has no bugs, it has no vulnerabilities and it has low support. However FEC build file is not available. You can download it from GitHub.

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.

            kandi-support Support

              FEC has a low active ecosystem.
              It has 28 star(s) with 2 fork(s). There are 2 watchers for this library.
              It had no major release in the last 6 months.
              FEC has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of FEC is current.

            kandi-Quality Quality

              FEC has 0 bugs and 0 code smells.

            kandi-Security Security

              FEC has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              FEC code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              FEC 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.

            kandi-Reuse Reuse

              FEC releases are not available. You will need to build from source code and install.
              FEC has no build file. You will be need to create the build yourself to build the component from source.
              FEC saves you 1519 person hours of effort in developing the same functionality from scratch.
              It has 3385 lines of code, 115 functions and 9 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed FEC and discovered the below as its top functions. This is intended to give you an instant insight into FEC implemented functionality, and help decide if they suit your requirements.
            • 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
            Get all kandi verified functions for this library.

            FEC Key Features

            No Key Features are available at this moment for FEC.

            FEC Examples and Code Snippets

            No Code Snippets are available at this moment for FEC.

            Community Discussions


            Python constructor recursion confusion
            Asked 2021-May-07 at 16:21

            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



            Answered 2021-May-07 at 16:21

            Looking 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:

            Source https://stackoverflow.com/questions/67438157


            PostgreSQL, insert with select fails on conflict do update
            Asked 2021-Apr-23 at 14:19

            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:



            Answered 2021-Apr-23 at 14:19

            EXCLUDED 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

            Source https://stackoverflow.com/questions/67230784


            Loading CSV into dataframe results in all records becoming "NaN"
            Asked 2021-Apr-15 at 13:49

            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.


            When I run this code, all of the records come back "NaN."



            Answered 2021-Apr-15 at 13:40

            Try this, worked for me:

            Source https://stackoverflow.com/questions/67109006


            WebView2 can't print html document with embedded pdf data (base64)
            Asked 2021-Mar-30 at 11:18

            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:



            Answered 2021-Mar-30 at 11:18

            This 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:

            1. ...
            2. 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.


            Until 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:

            Source https://stackoverflow.com/questions/66865895


            Avoid component to rerender at state change with hooks
            Asked 2021-Mar-27 at 09:15

            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...



            Answered 2021-Mar-27 at 09:15

            If 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

            Source https://stackoverflow.com/questions/66806174


            Problems in transmission and reception in USRP N210
            Asked 2021-Mar-22 at 21:42

            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.

            This is for TX Txcode1 Txcode2

            This is for RX RXcode1 RXcode2



            Answered 2021-Mar-22 at 21:42

            You'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.

            Source https://stackoverflow.com/questions/66714488


            What are some troubleshooting techniques for vim/ALE issues
            Asked 2021-Jan-19 at 00:51

            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:



            Answered 2021-Jan-18 at 18:49

            OMG: 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:

            1. Reinstall ALE
            2. Reinstall stylelint, eslint including npx eslint --init to start clean
            3. Try prettier
            4. Making many changes to the configuration/settings, including stripping all but the most fundamental pugins.
            5. Try different filetype settings
            6. aliasing/not aliasing eslint
            7. git bisect around recent changes
            8. 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!

            Source https://stackoverflow.com/questions/65746985


            How do I specify an array with multiple objects in a TypeScript interface?
            Asked 2021-Jan-16 at 21:32

            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:



            Answered 2021-Jan-16 at 21:32

            The type you've specified for feature is a tuple - a fixed length array whose elements have known types. The following is what you want:

            Source https://stackoverflow.com/questions/65754846


            Error Unziping a file - Jupyter Notebook - Python 2.x -3.x - AI Notebook -Google Cloud Platform
            Asked 2020-Oct-18 at 04:37

            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.



            Answered 2020-Oct-16 at 01:20

            Check the content of the file. It is probably an error message in html. (cat indiv20.zip)

            Source https://stackoverflow.com/questions/64381230


            How to configure VIM Ale to use the Tidy linter for HTML?
            Asked 2020-Oct-08 at 22:05

            I'm trying to configure the vim Ale plugin to use Tidy to lint HTML code. I added to my .vimrc file:



            Answered 2020-Oct-08 at 21:18

            You 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:

            Source https://stackoverflow.com/questions/63222422

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


            No vulnerabilities reported

            Install FEC

            You can download it from GitHub.
            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 .


            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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