Solomon | Asynchronous visitor tracking system
kandi X-RAY | Solomon Summary
kandi X-RAY | Solomon Summary
Asynchronous visitor tracking system
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Top functions reviewed by kandi - BETA
- Gets user information
- Return the SQL representation of an object
- Get the current user
- Context manager to suppress exceptions
- Convert string to unicode
- Open websocket connection
- Get the user id associated with the cookie
- Decode signed value
- Updates the bit array
Solomon Key Features
Solomon Examples and Code Snippets
Community Discussions
Trending Discussions on Solomon
QUESTION
I am familiar with RS codes and the classic syndrome-based decoding algorithm. However, I now have the task of implementing an alternative decoder, the Welch-Berlekamp algorithm. Here, the underlying application requires that no syndrome computation is required (I am aware that the syndrome-based approach is simpler in complexity than the Welch-Berlekamp algorithm).
Basically, I know that there are two different variants for RS codes.
- Original encoding scheme for Reed Solomon code, where there is a fixed set of data points known to encoder and decoder, and a polynomial based on the message to be transmitted, unknown to the decoder.
- BCH type code where a fixed polynomial known to both encoder and decoder.
For the original variant of RS codes, the implementation of the Welch-Berlekamp algorithm initially seems relatively easy to me. Here the system of equations can be set up from the generator matrix and the received symbols.
However, it is now required to implement the Welch-Berlekamp algorithm for the second variant. I am currently having difficulties here and I'm also in doubt as to whether this is even possible for this variant.
I would be very grateful if someone could help me if the Welch-Berlekamp algorithm can also be used for the BCH variant.
Best regards,
RatbaldMeyer
...ANSWER
Answered 2022-Mar-30 at 17:30implement the Welch-Berlekamp algorithm for the second variant
The parameters are not the same.
Variant 1 - Fixed set of data points. For a RS(n, k) code, decoders operate on n symbols to reconstruct the polynomial used to encode a message.
Variant 2 - Fixed generator polynomial with roots that are successive powers of primitive element α, such as (x-2) (x-4) (x-8) ... . For a RS(n, k) code, decoders generate and then operate on n-k syndromes to determine error locations (error locator polynomial) and error values. In the Wiki article linked to below, the syndromes are described as the result of evaluating the received message r(x) where syndrome[i] = r(α^i), but doesn't make it clear that r(α^i) is the same as r(x) modulo (x - α^i), only inferring it by noting that the syndromes "inherit" all the roots of the generator polynomial.
Welch-Berlekamp requires O(n^3) operations to invert a matrix. Gao's extended Euclid algorithm has time complexity O(n^2) if the initial and constant polynomial used by the decoder based on the fixed set of data points is pre-calculated (the Wiki article shows this polynomial as R[-1]).
https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction
QUESTION
I am building a user form that contains a date input field and a time dropdown picker. It needs to be accessible and compliant with the WCAG. I think it’s more intuitive for sighted users if we have a visual label to accompany the form controls. In order for screen reader users to have access to the content in the visual labels, I need to explicitly link the labels to the form controls.
As the dropdown is not a search field dropdown, it just has a trigger button.
CodeSandbox: https://codesandbox.io/s/competent-solomon-3nm8pe?file=/src/App.js:394-1066
Desired behavior:
Using a screen reader, the user will navigate to the start time dropdown menu, and the screen reader will announce: ‘menu button, submenu, start time, 12:00 PM’ or something along those lines. We want to get the visual label announced along with the current value of the dropdown.
Problem:
When the buttons contain textual content, screen readers such as NVDA do not expect any further labeling as it's usually not necessary. Adding further labeling, causes the screen reader announcements to not behave as expected. For example, the aria-label or aria-labelledby content is read and the content inside the button is not read. It doesn't seem like this kind of behavior is supported by screen readers for the button role.
Examples:
...ANSWER
Answered 2022-Mar-22 at 13:24The problem is that you're trying to assign both a label and a value to a button component, but that's not what a button is designed to do - it's meant to have a label and potentially a state (e.g., for toggle buttons). You've created a button menu that behaves as a select-only combobox but isn't semantically a combobox.
In my view, you have two options:
Re-write the Start Time and End Time button menus as select-only comboboxes. You can refer to the WAI-ARIA Practices example to get a sense of how this component should behave with a screen reader.
You could add a second non-visible label to your button with the selected time and link it to the button using
aria-describedby. This will announce the label, the role, and the value in the order you want:
QUESTION
I need help if there is any expert in XML and kotlin. I would like to know how to convert the below XML access it in kotlin code and then convert it into kotlin array file i.e. like (USD -> $) so the value of USD is the symbol which the unicode of from the XML.
I know in Android there is java utill class but the problem there is there is not all currencies symbols available i.e. for AFN -> there is AFN but in actual it should be -> ؋.
here is XML file:
...ANSWER
Answered 2022-Mar-06 at 18:55val xml = """
Albania Lek
Afghanistan Afghani
Argentina Peso
Aruba Guilder
Australia Dollar
Azerbaijan New Manat
"""
data class Currency(
val code: String,
val name: String,
val symbol: String
)
val currencies = xml.trimIndent()
.substringAfter(">").substringBeforeLast(")|()".toRegex())
.filter { s -> s.isNotBlank() }
Currency(
code = splitted.first(),
name = splitted.last(),
symbol = (splitted.drop(1).dropLast(1).lastOrNull() ?: "")
.split(",")
.filter { s -> s.isNotBlank() }
.map { s -> Integer.parseInt(s.trim(), 16).toChar() }
.joinToString("")
)
}
currencies.forEach { println(it) }
QUESTION
I have created a SimpleDialog in Flutter which shows all the list of country codes. Now I want some margin among all these items. Right now, these are tightly packed to each other.
This is how it looks: ]
Code
...ANSWER
Answered 2022-Feb-22 at 12:01Wrap your country code widget with Padding widget and add some padding to it, or with Container widget and add some padding/margin to it, like this:
QUESTION
here is how my dataset looks like, I am trying to filter out country that the 4th column is >= 1000.
...ANSWER
Answered 2022-Feb-01 at 00:47Assuming that your Input_file's last field may have spaces in it. You can also check it by doing cat -e Input_file it will show you where is line ending including hidden spaces at the line end. If this is the case then try following command.
QUESTION
I have the dataframe below with the multi.js input with flags and countries. As you will see it is obvious that the countries do not match with glags displayed. How can I fix that?
ANSWER
Answered 2022-Jan-25 at 22:58Instead of making use of separate vectors of country names and codes you could filter your country_df dataset for your desired countries2. Then replace all occurrences of countries and countries2 in your shiny code by the name and alpha.2 columns of country_df. Doing so makes sure that each code gets assigned to the right name:
QUESTION
I'm trying to transform a flat list of persons into a structured tree of ancestry.
The source array of persons looks like this:
...ANSWER
Answered 2022-Jan-07 at 03:37You are correct in the assumption that a general solution will involve some recursive calls (or a queue of candidates to expand until the queue is empty).
The output structure levels alternate between:
- a person with partnerships
- partnerships that contain a partner and children (each child is then again a 1.)
To make things simpler we can just model the 2 steps above with 2 separate functions. I chose the names expandPerson and expandPartnership.
QUESTION
I'm attempting to get data from Wikipedias sidebar on the 'Current Events' page with the below. At the moment this produces an array of Objects each with value title and url.
I would also like to provide a new value to the objects in array headline derived from the
headline, url and title. However, I'm unsure how to iterate through these.
Beautiful Soup Code
...ANSWER
Answered 2021-Dec-08 at 11:48Note: Try to select your elements more specific to get all information in one process - Defining a list outside your loops will avoid from overwriting
Following steps will create a list of dicts, that for example could simply iterated or turned into a data frame.
#1
Select all
- that are direct
siblings of a QUESTION
I have an HTML form that gets company information.
In that form, I have 2 elements (one for company countries and one for sectors) on which I used JQuery and Bootstrap to give them a nice style and to allow the user to choose multiple options in an easier manner.
The Problem: When the user clicks "Add Company Button" to add a new company section to the form, the appended elements are not being styled the same way.
The difference isn't between the first two select fields, it is rather between the first 2 select fields and the pairs that get added when you click 'Add Company'. The first two are appearing how I want them (2 rectangular boxes in which the user clicks on multiple options from the dropdown), while the others are appearing like an unstyled dropdown where you have to press Ctrl+click on the options you want to select
Please note that I removed the CSS and other parts of the page to keep things simple. Also in the appended section, I removed some options to stay within the character limit of this post
The code:
...ANSWER
Answered 2021-Nov-13 at 16:22The first two select elements are instance of select2 and the later element is native html select. You need to instantiate select2 for the dynamically generated select elements after hitting the add company button, inside the click handler,
$('.mul-select').select2();
here is the fiddle https://jsfiddle.net/vpof3ab5/
QUESTION
so I have a code snippet here basically presenting the idea Dan mentioned which is to lift contents up in react to naturally improve performance and write cleaner code. In the InputField component, the Button always renders, this is not the behavior I want, it should skip rendering the Button component .so what it should do is skip the render because Button is inputfield's children props, and if children props does not change, react will skip the render.
similar concept example explained by Dan: "When the color changes, ColorPicker re-renders. But it still has the same children prop it got from the App last time, so React doesn’t visit that subtree"
so I am confused here, is that the problem with multiple children props, because InputField has value, onChange, children props, and one of them change, react decides to update others? I have an example here that kinda proves it's not the problem of multiple props.
Edit: follow up question, in the real world, top level components must have all kinds of useState, state update etc. would that mean the "lift contents up" (component composition) is not practical in the real world? just from the perspective of saving some rendering computing power. (we know it has other benefits like help with some prop drilling) Are there any real world implementations, code examples??
...ANSWER
Answered 2021-Nov-06 at 00:14Thanks @Jacob Smit in the comments. solved my problem. My Button component is still two low in the component structure, the 'lift contents up' way is to lift the content(component) up in your code so that when you setState() in the lower component, it won't affect that content(component).so the lower component keeps the props that are bound to pass down. For here, exactly as Jacob said my setState() is triggering re-render of Button and InputField, so Button will be rendered.
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No vulnerabilities reported
Install Solomon
You can use Solomon 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.
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