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coding theory – Design Minimum length Hamming Code (n,k)

Design minimum length (n, k) Hamming code that will detect and correct 2-bit errors in 3-bit long messages. What is the Hamming distance of the code?

Follow this process:
Add k redundant bits to each m-bit data block to detect errors ( n = m + k)
Construct a set S of n-bit patterns corresponding to each m-bit data
block such that the minimum Hamming distance between any two n bit patters in S is d

Hamming distance of a code is the minimum distance between any two codewords of the code

design – What advice would you give a person planning to switch from figma to Sketch?

I have been using sketch for my low and hi fidelity wireframes and mockups for 2+ years now. I have only recently started to use figma occasionally and strangely enough, I am starting to like Figma. I might even be considering moving my entire workflow onto Figma.

What advice do you have for me ?

website design – Best way to present multiple types of data in a cluster bar chart?

enter image description here

This company has two different customer types and they all have two different kind of contracts. The aim here was to show all the contract prices in the same chart. As you can see I tried to map customer types with colors and contract types with patterns. As I was showing this around I saw that people couldn’t understand this very easily and mostly confused about reading the legend correctly. Is there a way to show this data in a different format that might be more understandable, or maybe minor changes here that I can’t see right now that will make reading this chart easier? Thank you.

Are design patterns liniar independent concepts?

It looks not all design patters are linear independent concepts. In my opinion design patterns can by classified in two categories, linear independent design patterns and non-linear independent design patterns. For example Abstract factory and Mediator design patterns are non-linear independent because they are using Strategy design pattern.
Do you know articles focusing on this topic?

interaction design – Mobile doodling with finger, and being able to scroll?

I am building a doodling app and I would like the user to be able to scroll the page and doodling with their finger.

I presume I must use buttons for the user to be able to switch between doodling and scrolling, however, I would be interested to know if there are any other solutions that may be better.

enter image description here

a. My solution was to simply have the pen and eraser tool be available to use, but by default the scrolling would be the primary interaction. Which is not ideal as I would like the user to interact with the page first by doodling on the page (not scrolling).

b. I run into the issue that if the user has pen tool (doodling) as their primary interaction, they won’t realize that there is a way to scroll as well (unless they tap on the pen tool to clear the selection)

Any thoughts on this.. Is there a better solution?

Thank you.

design patterns – Should there only ever be one instance of a ViewModel object?

Assume a rather simplistic model:

class Person{   
   static List<Person> LivingPersons

   String Name
   List<Person> Dependents 

From this it can (hopefully) be seen that a single Person object can be both within the LivingPersons list and within the Dependents list of another Person object. Similarly, if there were a couple of ViewModels to represent this model:

class ViewModel_LivingPersons{
   static List<ViewModel_Person> LivingPersons

class ViewModel_Person{
   String Name
   List<ViewModel_Person> Dependents   

If I had a single Person object that resided in both the LivingPersons list and within the Dependents list of another Person, my gut feeling tells me that as it is the same model object being represented there should only ever be one instance of a ViewModel_Person to represent this model object. However, I do not know why, nor if this is best practice.

I’m not certain of the best practices here. I’ve done a bit of searching, but cannot find anything on this particular issue.

gui design – How should I provide the “select nothing” option in my icon picker?

I work on a desktop application that lets people create visual scripts. They can add properties to objects, and every property can have a user-defined icon for easy identification. I have added a picker widget that looks like a large button showing the icon, and when clicked opens a menu that lets the user select from the complete list of emoji.

However there is currently no way for the user to disable the icon (“clear” or “select none”), and I am wondering how to implement this. I have thought of the following:

  • add a right-click context menu with a single “Clear” or “Select None” entry; I don’t like this because it is not obvious that right-clicking will do anything, and a popup menu with only one entry seems weird.
  • add an empty emoji at the beginning of the list, so the user can select it just like the others; I don’t like this because they will need to scroll to the top of the list, and maybe even navigate to the first tab; also none of the emoji have any borders so an empty button will just be appear as a blank space, and may even look like a rendering bug to the user.
  • add a “Clear” button… somewhere in the picker menu? I could not find a good place to put it. Also, should it have text or would an icon suffice? The emoji are very diverse and colourful, so an icon may not be appropriate.
  • add a “Clear” button outside the picker. If so, what should it look like?

What are good examples that I could get inspiration from?

For reference, here is what the picker looks like right now:

emoji picker

Here is what an empty entry would look like:

empty button

And an external button:

external button

database design – Monitoring and Reporting of KPI data

I’m trying to review how I collect, manage and report on the KPIs I receive from external suppliers.
Each sends a spreadsheet, with each row reporting the following:

| Supplier | Reporting Period | Customer | Contract Ref | Product Type | KPI 1 | KPI 2 | … | KPI 50 |

Each supplier provides around 50-100 rows per month, but not all KPI metrics are populated since it depends upon the type of product and/or contract. I then collate and aggregate so that I can report and compare data per supplier, per customer, and per product. So, for example, Product 1 may be obtained from 3 different suppliers, with KPI 1 being the number of units obtained, and KPI 2 the deviation from the expected mean dimension.

I’ve now reached a point where the quantity of data I am manually manipulating is untenable. Therefore, I have to re-design my approach.

My first approach has been to look at a relational approach. So, I’ve split this table into two:
The first creating an autonumber as a primary key, to refer to the distinct combination of Supplier & Period & Customer & Contract & Product; and
The second with three columns only: the foreign key, the KPI name, and the KPI value.
I’m then planning to apply a pivot transformation and sum the various KPI values prior to reporting as I currently do.

I’m at the point now where (a) I am not entirely sure how to do the transformation, so that I can pull out the aggregate values for KPI 1 over time, and graph this; and (b) whether this is the best approach at all. Might I be better looking at a nosql implementation (which I know little about)?

domain driven design – DDD how to validate whole aggregate

I have AggregateEntity

class AggregateEntity {

   private EntityA entityA;
   private EntityB entityB;
   private EntityC entityC;
   //.. more here
   public final void assertThatPolicyIsFulfilled(Policy policy) {

      bolean result = policy.checkEntityA(entityA) 

      if(!result) throw new Exception();

This approach has few disadvantages.
How I can validate whole aggregate with better way?