Posts (page 146)
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7 min readCalculating the momentum in SQL involves analyzing a time series dataset to understand the rate of change of a particular variable over a specific period. This can be achieved by calculating the difference between the current value of the variable and its value at a previous time point. Momentum can provide insights into the direction and strength of trends in the data, and is often used in financial analysis to predict future price movements.
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4 min readIn order to authenticate a user on a Substrate chain in Rust, you can use the account_id::AccountID::from_ss58check() function to convert a string representation of an address to an AccountID struct. This struct can then be used to verify the authenticity of a user on the blockchain. Additionally, you can use the frame_identity::Identity::verify() function to authenticate and validate a user's identity on the blockchain.
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5 min readIn Rust, returning "!" signifies that a function will never return a value or complete its execution. This symbol represents the type "never", which indicates that the function will always panic or encounter an unrecoverable error. This can be useful for situations where a function is designed to terminate the program rather than returning a specific value. It ensures that the program will not try to continue executing if the function encounters a critical error.
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7 min readThe Average True Range (ATR) is a technical analysis indicator that measures market volatility by calculating the average range between a series of highs and lows. In Kotlin, you can implement the ATR indicator by first collecting a series of high and low price data points for a given period.
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3 min readIn Rust, you can return a function that returns a trait by defining a trait object as the return type of the function. To do this, first define a trait that specifies the behavior you want the returned function to have. Then create a function that returns a Box where Trait is the name of the trait you defined. This Box is a trait object that can store any type that implements the Trait.
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7 min readThe Rate of Change (ROC) is a technical indicator used in financial analysis to measure the speed at which a variable is changing. In Clojure, you can calculate the ROC of a dataset by first identifying the initial value and the final value of the variable you are measuring. Then, divide the difference between the final value and the initial value by the initial value, and multiply the result by 100 to get the percentage change.
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5 min readIn Rust, closures can capture variables from their surrounding scope. To return a reference inside a closure, you need to ensure that the reference outlives the closure itself. This can be achieved by using the 'move' keyword to force the closure to take ownership of the variables it captures. By doing this, the closure can return a reference to those variables without worrying about their lifetime.
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5 min readIn SQL, you can calculate Fibonacci extensions using recursive queries to generate the Fibonacci sequence. The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding numbers. By calculating the Fibonacci sequence, you can determine Fibonacci extensions by multiplying each Fibonacci number by a specified factor. This can be useful for predicting potential future support or resistance levels in financial markets or analyzing patterns in numerical data.
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4 min readTo sort a vector in descending order in Rust, you can use the sort_by_key method with the Reverse wrapper from the standard library's std::cmp::Reverse module. This allows you to sort the vector by a custom comparison function that reverses the order. Here's an example code snippet to demonstrate sorting a vector in descending order: use std::cmp::Reverse; fn main() { let mut vec = vec![5, 2, 9, 1, 7]; vec.sort_by_key(|&x| Reverse(x)); println!("{:.
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5 min readParabolic SAR (Stop and Reverse) is a technical indicator used in trading to determine potential reversals in the price direction of an asset. It is often used by traders to set stop-loss orders and to make decisions on when to enter or exit trades.To compute Parabolic SAR using R, you can use the TTR package which provides functions for technical analysis. First, you will need to load the TTR package in R by using the library function.
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5 min readTo iterate over several option vectors in Rust, you can use a combination of zip and iter methods. For example, suppose you have two option vectors a and b. You can use the zip method to create an iterator that combines elements from both vectors, and then use the iter method to iterate over the combined elements. Here's an example code snippet: fn main() { let a = vec![Some(1), Some(2), None]; let b = vec![Some(3), Some(4), Some(5)]; for (elem_a, elem_b) in a.iter().zip(b.
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8 min readThe Average Directional Index (ADX) is a popular technical analysis indicator used to measure the strength of a trend. It is often used by traders to determine the presence and strength of a trend, as well as to determine whether a trend is gaining or losing strength.In R, the ADX indicator can be easily calculated using the 'ADX' function from the 'TTR' package. To calculate the ADX, you will need to have the high, low, and close prices of the stock or asset you are analyzing.