Implementing the Sieve of Eratosthenes in Delphi
The Sieve of Eratosthenes is a very fast, but memory intensive algorithm to find the primes under a given value.
Posts by Category
Algorithms
Bash on Ubuntu on Windows
Installing node-red on Bash on Ubuntu on Windows
A simple how-to showing the process of installing node-red on Bash for Ubuntu on Windows
Data Science
Notes on Udemy Class: R, ggplot, and Simple Linear Regression
Working through a free course at Udemy R, ggplot, and Simple Linear Regression. My notes will follow
Notes on Datacamp’s Kaggle R tutorial
Kaggle has a tutorial competition on the survival of the passengers of the Titanic. Datacamp has a handy tutorial on using R to tackle the problem. Here are ...
Getting Started with R - Part 9: Lists and the [[]] operator
Lists allows us to keep a collection of various objects together
Getting Started with R - Part 8: Data frames - Construction, Subsetting and Structure
Vectors and matrices are designed to hold single types. When we need to mix data types in a tabular form we can use a data frame.
Getting Started with R - Part 7: Factors - Levels and Labels
Factors are like vectors but with values classed into levels. When vectors have a limited number of repeated values they fit the bill.
Getting Started with R - Part 6: Matrices - Captions
Adding Captions to matrices make them more readable and allows us to retain information when we subset the matrix.
Getting Started with R - Part 5: Matrices - Creating, Filling and Subsetting
Often we have the need to arrange data in a structure with rows and columns, or we need to represent a collection of vectors. R has a built-in matrix type th...
Getting Started with R - Part 4: Vector Extracting, Replacing and Excluding
Reaching beyond the basic indexing of Vectors we started in our previous post Vectors Operations we will continue selecting, subsetting, replacing vectors be...
Getting Started with R - Part 3: Vector Operations
Expanding on our Vectors Basics we will continue with operations accross vectors.
Getting Started with R - Part 2: Vector Basics
Expanding on the basics of the simple data classes in Part 1: The Console and Variables, we now start with the first higher dimension construct: vectors
Getting Started with R - Part 1: The Console and Variables
Here is a very fast moving tutorial in getting started in R. Hold on to your hat
Data Transmission
Data Transmission with Delphi Redux
In this blog post I will revisit my series from four years ago and update it with more current technology
Data Transmission with Delphi (Part 3: Transmitting and Interpreting Data)
In this blog post I will continue with arrays in communicating cross-platform via DLLs.
Data Transmission with Delphi (Part 2: Arrays and Pointer Math)
In this blog post I will continue with arrays in communicating cross-platform via DLLs.
Data Transmission with Delphi (Part 1: Pointers and Structures)
In this blog post I will start to describe the data structures and the use of pointers in communicating cross-platform via DLLs.
Design Patterns
A Successful Object Edit Pattern
A successful Object-Oriented Design Pattern for editing objects. This pattern allows free editing of objects, while allowing cancellation and preservation of...
Active Object Design Pattern in Delphi (Part 4): The Servant and the Proxy
In this blog post I will continue to describe the process to develop a solution in Delphi using the Active Object Design Pattern. Specifically, we will see h...
Active Object Design Pattern in Delphi (Part 3): Futures (Promises)
In this blog post I will continue to describe the process to develop a solution in Delphi using the Active Object Design Pattern. Specifically, we will see h...
Active Object Design Pattern in Delphi (Part 2): The Scheduler (Activation Queue)
In this blog post I will continue to describe the process to develop a solution in Delphi using the Active Object Design Pattern. Specifically, we will see h...
Active Object Design Pattern in Delphi (Part 1): Method Requests
In this blog post I will start to describe the process to develop a solution in Delphi using the Active Object Design Pattern. This pattern is a concurrency ...
Fundamental Object Oriented Design Principles (Part 3): Polymorphism
A look at Polymorphism as provided by Object Oriented languages and how one code structure (method, operator or reference) can have many implementations
Fundamental Object Oriented Design Principles (Part 2): Encapsulation
A look at Encapsulation as provided by Object Oriented languages and how it combines data and functionality.
Fundamental Object Oriented Design Principles (Part 1): Abstraction
A look at Abstraction as provided by Object Oriented languages and how it hides details
Gang-of-Four Creational Design Pattern Examples in Delphi
Delphi versions of the Maze code samples of Creational Design Patterns in “Design Patterns: Elements of Reusable Object-Oriented Software”.
Memory Management
A Dynamic Record Pool with Stable Pointers in Delphi
The design of a memory pool in Delphi that holds records. Its purpose is to speed up dynamic memory allocation of a large number of the same record type.
Technology
Why you can’t get text messages from iPhones
Who is to blame for when a Samsung user with a new phone number can’t get text messages from iPhones?
Utilities
An Array Builder for Delphi
The design of an array builder in Delphi that holds records. Its purpose is to simplify the growth of an array as new elements are added, while improving spe...