Bokeh Plot with Selectable Columns Introduction Bokeh is an interactive visualization library that allows users to create web-based interactive plots and dashboards. In this article, we will explore how to use Bokeh to create a plot where the user can select different columns from a pandas DataFrame. We will also cover the concepts of ColumnDataSource, CustomJS, and Select in Bokeh. These are essential components for creating dynamic and interactive visualizations with Bokeh.

Understanding Video Trimming in iOS using AVFoundation Introduction Video trimming is a common requirement in many applications, including video editing and sharing apps. In this article, we will explore how to trim a video using AVAssetExportSession in iOS. We’ll dive into the code, explain each step, and provide examples to ensure you have a solid understanding of the process. What is AVFoundation? AVFoundation is a framework in iOS that provides classes for working with audio and video.

Formatting User Inputs into a Matrix with Percentage and Decimal Formatting The question presented in the Stack Overflow post is about formatting user inputs into a matrix while passing the values through as numerics for calculations. The goal is to format all default values and user inputs in certain columns of the matrix with percentages and a minimum of 2 decimal places shown, without rounding. This formatting needs to persist even when the user changes their input.

Concatenating 3 Different Strings and Storing the Resulting String in a Column In this article, we’ll explore how to concatenate three different strings using SQL and store the resulting string in a column. This technique is commonly used in data manipulation and analysis. Understanding Concatenation in SQL Concatenation is the process of joining two or more strings together to form a single string. In SQL, concatenation can be achieved using various methods, including the use of operators like ||, which is often considered the most efficient way to concatenate strings in a SQL query.

Passing Values between View Controllers in iOS Navigation Controllers Introduction When building user interfaces for iOS applications, it’s common to work with multiple view controllers, each managing its own view and interacting with other parts of the app. One essential aspect of this workflow is passing data from one view controller to another, ensuring that the desired information is displayed on screen. In this article, we’ll explore how to pass values between view controllers in an iOS navigation controller.

Splitting Strings in SQL: Understanding the Concept and Implementation When dealing with string data in SQL, it’s often necessary to manipulate or transform the data into a more usable format. One common operation is splitting a string at each character, which can be useful for creating new columns, performing operations on individual characters, or even generating reports. In this article, we’ll delve into how to achieve this using T-SQL, focusing on a specific example that involves creating an additional column to indicate whether the split character is a number or not.

Converting Day Number to Day and Week Name in Bar Plot X-Axis in R In this tutorial, we will explore how to convert day numbers to their corresponding day names and week names in a bar plot’s x-axis using the popular R programming language. Introduction to the Problem When working with time series data or scheduling information, it is often necessary to represent dates or days of the week in a visual format.

Ignoring Invalid Data when Casting to Timestamp Type Casting data from one type to another can be a common operation in SQL, but it’s not always straightforward. In the case of timestamp types, invalid values can cause errors or unexpected results. In this article, we’ll explore how to ignore invalid data when casting to a timestamp type. Understanding PostgreSQL’s Timestamp Type PostgreSQL’s timestamp type is a complex data structure that represents dates and times.

Introduction to Pandas DataFrames and GroupBy Operations Pandas is a powerful library used for data manipulation and analysis in Python. It provides data structures and functions designed to efficiently handle structured data, including tabular data such as spreadsheets and SQL tables. In this article, we will explore how to create a new column based on the previous value within the same group in a Pandas DataFrame using the groupby function.

Linear Regression with Specified Slope Introduction Linear regression is a widely used statistical technique for modeling the relationship between two or more variables. In this article, we will explore how to fit a linear regression line with a specified slope to a dataset. Background The general equation of linear regression is: Y = b0 + b1 * X + ϵ where Y is the dependent variable, X is the independent variable, b0 is the intercept, b1 is the slope, and ϵ is the error term.