Detecting Touches on Non-Transparent Pixels of UIImageView =========================================================== In this article, we will explore how to detect touches only on non-transparent pixels of a UIImageView. We’ll delve into the technical aspects of image processing, gesture recognisers, and touch events. Understanding the Problem The task is straightforward: when a user touches the screen, we want our application to respond only if the touch occurs on non-transparent pixels of an UIImageView. This approach ensures that our app remains responsive while also providing a more accurate representation of user input.

CREATE OR REPLACE FUNCTION get_marks() RETURNS TABLE ( id INTEGER, mark1 INTEGER, mark2 INTEGER, mark3 INTEGER, mark4 INTEGER, mark5 INTEGER, mark6 INTEGER, mark7 INTEGER, mark8 INTEGER, mark9 INTEGER, mark10 INTEGER ) AS $$ DECLARE v_info TEXT; BEGIN RETURN QUERY SELECT id, COALESCE(ar[1]::int, 0) AS mark1, COALESCE(ar[2]::int, 0) AS mark2, COALESCE(ar[3]::int, 0) AS mark3, COALESCE(ar[4]::int, 0) AS mark4, COALESCE(ar[5]::int, 0) AS mark5, COALESCE(ar[6]::int, 0) AS mark6, COALESCE(ar[7]::int, 0) AS mark7, COALESCE(ar[8]::int, 0) AS mark8, COALESCE(ar[9]::int, 0) AS mark9, COALESCE(ar[10]::int, 0) AS mark10 FROM ( SELECT id, array_replace(array_replace(array_replace(regexp_split_to_array(info, ''), '.

Understanding the General Error: 1364 Field ‘id’ Doesn’t Have a Default Value In this article, we will explore why the SQL error General error: 1364 Field 'id' doesn't have a default value occurs and how it can be resolved. We will also delve into the details of how auto-incrementing primary keys work in databases. What is an Auto-Incrementing Primary Key? An auto-incrementing primary key is a column that automatically assigns a unique, incremental value to each new record inserted into a table.

Fetching Array Contents: A Deep Dive into SQL Queries =========================================================== As a technical blogger, I often encounter queries like the one in question. In this article, we’ll dive into the world of array contents in SQL and explore how to fetch only the contents, excluding brackets. Introduction to Array Contents in SQL In modern databases, it’s common for columns to store data in an array format. This allows you to store multiple values in a single column, which can be particularly useful when working with large datasets.

Installing R for Jupyter Notebook in Anaconda ============================================= In this article, we will explore how to install R for use with Jupyter notebooks on Anaconda. Anaconda is a popular distribution of Python and other packages that also includes R as one of its supported tools. Prerequisites Before we begin, ensure you have Anaconda installed on your system. If not, please refer to the official Anaconda documentation for installation instructions. Installing Anaconda Download the Anaconda installer from the official Anaconda website.

Understanding SQL Server’s Non-Evaluating Expression Behavior SQL Server is known for its powerful and expressive features. However, sometimes this power comes at the cost of unexpected behavior. In this article, we’ll delve into a peculiar case where SQL Server returns an unexpected result when using the SELECT COUNT function with an integer constant expression. Background on SQL Server’s Expression Evaluation SQL Server follows a set of rules for evaluating expressions in SQL queries.

Calculating a Date Range from Monday to Sunday in MySQL Understanding the Problem The problem requires creating a new field that displays a date range from Monday to Sunday, including the date an object was created. This involves calculating the start and end dates based on the date_create column. Background and Context MySQL provides several functions for working with dates, including DATE(), TIMESTAMP(), and ADDDATE(). The UNION operator is used to combine multiple queries into a single result set.

Displaying CSV Data in Tabular Form with Flask and Python =========================================================== In this article, we will explore how to display CSV data in a tabular form using the Flask framework with Python. We will go through the process of setting up a basic web application that allows users to upload CSV files without saving them, and then displays the uploaded data in a table view. Introduction The Flask framework is a lightweight and flexible web development library for Python.

Enabling Portrait Mode in Landscape View Controllers and Vice Versa In this article, we will explore how to switch between portrait mode and landscape mode for view controllers. This is particularly useful when you want to display your app in different orientations based on the device’s screen orientation. Understanding the Basics of Auto-Rotation When an iOS app runs on a device with a touchscreen display, the system automatically adjusts its layout according to the device’s screen orientation.

Identifying Relationship Between Two Columns Using Pandas =========================================================== Pandas is a powerful library in Python that provides data structures and functions to efficiently handle structured data. One of the key features of pandas is its ability to manipulate and analyze data, including identifying relationships between columns. In this article, we will explore how to identify relationship between two columns using pandas. We’ll cover the basics of pandas, how to create a DataFrame, and how to use various functions to identify relationships between columns.