Posts (page 394)
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4 min readOptionals in Swift are used to represent a value that may or may not be present. They are a way to handle cases where a variable may have a value or may be nil.To use optionals in Swift, you declare a variable or constant as an optional by appending a "?" to the type. This tells Swift that the variable can either contain a value of the specified type or be nil.When accessing the value of an optional variable, you need to use optional binding to safely unwrap the optional.
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4 min readTo decode some strange JSON data in Swift, you can use the Codable protocol along with the JSONDecoder class provided by the Foundation framework. First, define a struct or a class that conforms to the Codable protocol and represents the structure of the JSON data you are trying to decode. Then, create an instance of JSONDecoder and use its decode method to decode the JSON data into your custom data type.
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6 min readTo create discounts or coupons in Shopify, you can navigate to the Discounts section in your Shopify admin panel. From there, you can click on the "Create discount" button to start setting up a new discount or coupon. You can choose the type of discount you want to offer, such as a fixed amount off, percentage off, free shipping, or buy one get one free.
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7 min readUsing a yoga ball can help improve flexibility by allowing you to perform stretches and exercises that may be harder to do on the floor. To improve flexibility with a yoga ball, you can incorporate it into your regular stretching routine by using it to support your body in various poses and stretches. The unstable surface of the ball can also help to engage more muscles and deepen your stretches as you work to balance and stabilize yourself.
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6 min readTo plot a cell array with dimensions (31*1) in MATLAB, you can follow these steps:Create a cell array of size 31*1 using curly braces {}. Each element of the cell array will contain the data you want to plot. For example, let's assume you have a cell array named data with dimensions (31*1). Each cell element in data contains a numeric array that represents the data points to be plotted.
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7 min readThe Hull Moving Average (HMA) is a popular technical indicator used in trading to analyze price movements and identify trend reversals. Unlike traditional moving averages, the HMA seeks to eliminate lag and provide more accurate signals by employing a weighted moving average along with the square root of the period. Here is an overview of how to trade with the Hull Moving Average:Identifying the Trend: The first step is to determine the overall trend in the market.
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5 min readTo read data correctly in MATLAB, you can consider the following steps:Open the data file: Use the fopen function to open the file in MATLAB. Specify the file name along with the appropriate file access mode (e.g., 'r' for reading). Determine the file format: Identify the format of the data in the file, such as plain text, binary, CSV, Excel, etc. This will help you choose the appropriate function for reading the data.
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4 min readTo change the file extension of a file using MATLAB, you can follow these steps:Obtain the complete file name along with its current extension.Use the MATLAB built-in function fileparts to split the file name into its components. fileparts returns the file path, file name, and file extension separately. Example: [filepath, name, ext] = fileparts('filename.txt') Set the new extension that you want to change the file to.
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9 min readThe Vortex Indicator is a technical analysis tool used in financial markets to identify the start of a new trend or a reversal of an existing trend. It was developed by a technical analyst named Etienne Botes and economist Douglas Siepman.The indicator consists of two lines: the Positive Vortex Line (VI+) and the Negative Vortex Line (VI-). These lines are calculated based on true range and directional movement.
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9 min readThe Triangular Moving Average (TMA) is a technical indicator commonly used in scalping strategies. It is a type of moving average that places more weight on recent price data while smoothing out fluctuations. Unlike simple moving averages that assign equal weight to all data points, the TMA gives more significance to the middle portion of the time series.The TMA is calculated by taking the average of the price over a specified period, starting from the central point and moving outwards.
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11 min readA Simple Moving Average (SMA) is a commonly used technical analysis tool that helps traders and investors identify trends and potential price reversals in financial markets. It is a calculation method that smoothes out price data over a specified period to generate a single trend line.The SMA is calculated by adding up a specified number of closing prices for a given period and dividing the sum by the number of periods.
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11 min readThe Average Directional Index (ADX) is a technical indicator that measures the strength and direction of a trend in the market. It helps traders identify the strength of a trend and whether it is worth trading.To use the ADX, you start by calculating the Plus Directional Indicator (+DI) and the Minus Directional Indicator (-DI). These indicators evaluate the strength of positive and negative price movements over a specific period.