Advertisements I have a function with reference input, and return: return value: if input is valid return error: if input is invalid fn get_fourth(input: &Vec<i32>) -> Result<i32, ParseIntError> { let q = match input.get(4) { Some(v) => v, _ => return Err(ParseIntError {kind: ParseIntError} ) }; Ok(*q) } ParseIntError is just temporary for my testing… Read More Rust Vec: How to return error with Result<T,E>?
Advertisements I want a Vec<CustomType> to be joinable by &str. Here is a minimal example of what I’ve tried so far: #[derive(Debug)] struct Item { string: String, } impl Item { pub fn new(string: impl Into<String>) -> Self { Self { string: string.into(), } } pub fn to_string(&self) -> &String { &self.string } } impl… Read More Allow Vec of custom type to be joined with &str
Advertisements I have basic df and I’m trying to add different color for each bar. According to e_color doc we need to provide a vector of colors but it doesn’t work, I’m getting only one color from the vector. Additionally I’d like to rotate by 45dg x axis label but haven’t found any solution yet.… Read More How to color bar chart & rotate axis label in echarts4r
Advertisements When I call the method with 142.14, I don’t get any errors, but nothing prints to the console at all. When I send 142, it works as intended. Why is this? This code is in Java and I need to add more details to ask this question so here I am adding more details.… Read More Java method working with an int but not a double
Advertisements I was making a Physics Engine in C++ when I noticed that when I replace: float absDistance = sqrt(vectorDistance.x * vectorDistance.x + vectorDistance.y * vectorDistance.y); With: float absDistance = abs(vectorDistance.x) + abs(vectorDistance.y) Different things happen. I’m using the library <cmath> I looked at a lot of stack exchanges but I couldn’t find anyone saying… Read More Why is abs(x)+abs(y) different from sqrt(x*x + y*y)
Advertisements I have panel data and I would like to get the percentage of observations in a column (Size) that are below 1 million. My data is the following: structure(list(Product = c("A", "A", "A", "A", "A", "A", "B", "B", "B", "B", "B", "B", "C", "C", "C", "C", "C", "C"), Date = c("02.05.2018", "04.05.2018", "05.05.2018", "06.05.2018",… Read More R: Calculate percentage of observations in a column that are below a certain value for panel data
Advertisements this is a sentiment analysis model made with tf-idf for feature extraction i want to know how can i save this model and reuse it. i tried saving it this way but when i load it , do same pre-processing on the test text and fit_transform on it it gave an error that the… Read More Keep model made with TFIDF for predicting new content using Scikit for Python
Advertisements I am trying to set up a class that initializes with a 2d array of an unknown size at compile time. I figured the best way to do this would be to pass the array as a pointer. This works as expected with a 1d array, but when I try to do the same… Read More Passing 2D array as class parameter
Advertisements Why does printf output characters instead of data? Looking at the code, you can relatively understand what I want to do, but it is unclear why the output is like this #include <vector> #include <string> #include <cstdio> class Person { public: Person(const std::string& name, uint16_t old) : m_Name(name) , m_Old(old) { } public: std::string… Read More Why does printf output characters instead of data?
Advertisements I made top down shooter game where enemies are following the player. If they touch you, they push you with AddForce. I’ve managed to do that but only on specific direction. Problem is that if enemy is coming from player’s right, they still gonna push you to the right and not to the opposite… Read More push object with add force in Unity3D