function

问题 This question already has answers here : Dynamic variable names in Bash (16 answers) How to use a variable's value as another variable's name in bash [duplicate] (6 answers) Closed 3 years ago . In my bash scripts, I often prompt users for y/n answers. Since I often use this several times in a single script, I'd like to have a function that checks if the user input is some variant of Yes / No, and then cleans this answer to "y" or "n". Something like this: yesno(){ temp="" if [[ "$1" =~ ^([Yy

问题 This question already has answers here : Is there a way to provide named parameters in a function call in JavaScript? (10 answers) Closed 1 year ago . So imagine we got a function like below, and I want to use the default value for the first parameter a and a custom value for second parameter b . const func = (a = 1 , b = 2) => { console.log("a is equal to " + a, " and b is equal to " + b) } I want to just pass one value for parameter b. something like this: func(b : 7); // I want it to print

问题 I know this question has been asked before, and my solution is the same as many of the answers but I have a special test case that won't work correctly with the common solution to this problem. The solution that I have found for the zip problem like many others is (define (zip l1 l2)(map list l1 l2)) . . .which works great with given arguments such as (zip '(a b c) '(1 2 3)) => ((a 1) (b 2) (c 3)) but I also want the zip function to work for cases where my arguments do not match length like

问题 I know this question has been asked before, and my solution is the same as many of the answers but I have a special test case that won't work correctly with the common solution to this problem. The solution that I have found for the zip problem like many others is (define (zip l1 l2)(map list l1 l2)) . . .which works great with given arguments such as (zip '(a b c) '(1 2 3)) => ((a 1) (b 2) (c 3)) but I also want the zip function to work for cases where my arguments do not match length like

问题 how can I make this possible? function _(element) { var el = document.querySelector(element); return el; } function colorize(color) { this.style.color = color; } _("#myElement").colorize("#f0f0f0"); that this code first gets the element and then changes its text color. How to make sth like this????? 回答1: _("#myElement") returns an instance of Element. You can add colorize property to Element.prototype . Now, all objects of type Element will be able to call it: function _(element) { var el =

问题 how can I make this possible? function _(element) { var el = document.querySelector(element); return el; } function colorize(color) { this.style.color = color; } _("#myElement").colorize("#f0f0f0"); that this code first gets the element and then changes its text color. How to make sth like this????? 回答1: _("#myElement") returns an instance of Element. You can add colorize property to Element.prototype . Now, all objects of type Element will be able to call it: function _(element) { var el =

问题 Suppose I have a function like that: public void Set(int a, string b, char c, float d, int e, float f, string g){ //do something with a //do something with b //... //do something with g } I need to do only some of these things, based on the arguments I want to send to the function. The rest should be ignored. For example: Set(a: 1, c: 'x', f: 1.4f, g: "hello") . Only the arguments I sent must be taken in account, the rest should just be ignored. How can I write such function that behaves like

问题 Suppose I have a function like that: public void Set(int a, string b, char c, float d, int e, float f, string g){ //do something with a //do something with b //... //do something with g } I need to do only some of these things, based on the arguments I want to send to the function. The rest should be ignored. For example: Set(a: 1, c: 'x', f: 1.4f, g: "hello") . Only the arguments I sent must be taken in account, the rest should just be ignored. How can I write such function that behaves like

问题 Im writing my own function to calculate the mean of a column in a data set and then applying it using apply() but it only returns the first columns mean. Below is my code mymean <- function(cleaned_us){ column_total = sum(cleaned_us) column_length = length(cleaned_us) return (column_total/column_length) } Average_2 <- apply(numeric_clean_usnews,2,mymean,na.rm=T) 回答1: We need to use the na.rm=TRUE in the sum and using it in apply is not going to work as mymean doesn't have that argument mymean

问题 I am trying to implement KNN classifier in R from scratch on iris data set and as a part of this i have written a function to calculate the Euclidean distance. Here is my code. known_data <- iris[1:15,c("Sepal.Length", "Petal.Length", "Class")] unknown_data <- iris[16,c("Sepal.Length", "Petal.Length")] # euclidean distance euclidean_dist <- function(k,unk) { distance <- 0 for(i in 1:nrow(k)) distance[i] <- sqrt((k[,1][i] - unk[,1][i])^2 + (k[,2][i] - unk[,2][i])^2) return(distance) }