loops

问题 So I have this in Matplotlib. plt.scatter(X[: , 0:1][Y == 0], X[: , 2:3][Y==0]) plt.scatter(X[: , 0:1][Y == 1], X[: , 2:3][Y==1]) plt.scatter(X[: , 0:1][Y == 2], X[: , 2:3][Y==2]) I'd like to know if there's a better way to loop instead of this: for i in range(3): plt.scatter(X[: , 0:1][Y == i], X[: , 2:3][Y==i]) MVCE: # CSV: https://gist.githubusercontent.com/netj/8836201/raw/6f9306ad21398ea43cba4f7d537619d0e07d5ae3/iris.csv data = np.loadtxt('/content/drive/My Drive/Colab Notebooks/Machine

问题 I have been working on a rejection sampling code using several loops. After updating R and tidyverse I found that the code no longer works, displaying the following error: Error: Assigned data `mapply(...)` must be compatible with existing data. i Error occurred for column `sampled`. x Can't convert from <integer> to <logical> due to loss of precision. * Locations: 1. Run `rlang::last_error()` to see where the error occurred. In addition: Warning message: In seq.default(x, y, na.rm = TRUE) :

问题 I'm trying to write a loop that calculates power without using the pow() function. I'm stuck on how to do that. Doing base *= base works for even powers upto 4, so there is something totally weird that I can't seem to figure out. int Fast_Power(int base, int exp){ int i = 2; int result; if(exp == 0){ result = 1; } if(exp == 1){ result = base; } else{ for(i = 2; i < exp; i++){ base *= base; result = base; } } return result; } 回答1: First off, I agree it was probably a mistake to use base *=

问题 I have the following task which is that: There may be up to ten teams. Parallel Arrays are used to store the team Names, as well as to keep track of the number of Wins, Overtime Losses, and Points. After the result for the last team is entered, the program outputs a summary of each team's record in the opposite order to which they were entered. Note: "W" is worth 2 points, "L" is worth 0 points, "O" is worth 1 point Sample input: 3 //Option number Toronto //phrase W //letters that loop in a

问题 C beginner here. For the program below, whenever the user inputs a character or a string it enters an infinite loop. How would you fix this while still using scanf? And what would be the better methods of writing this program rather than using scanf? Thanks to those who will answer. #include <stdio.h> #include <ctype.h> int main() { int rounds = 5; do { printf("Preferred number of rounds per game. ENTER NUMBERS ONLY: "); scanf("%d", &rounds); } while(isdigit(rounds) == 0); return 0; } 回答1: I

问题 C beginner here. For the program below, whenever the user inputs a character or a string it enters an infinite loop. How would you fix this while still using scanf? And what would be the better methods of writing this program rather than using scanf? Thanks to those who will answer. #include <stdio.h> #include <ctype.h> int main() { int rounds = 5; do { printf("Preferred number of rounds per game. ENTER NUMBERS ONLY: "); scanf("%d", &rounds); } while(isdigit(rounds) == 0); return 0; } 回答1: I

问题 C beginner here. For the program below, whenever the user inputs a character or a string it enters an infinite loop. How would you fix this while still using scanf? And what would be the better methods of writing this program rather than using scanf? Thanks to those who will answer. #include <stdio.h> #include <ctype.h> int main() { int rounds = 5; do { printf("Preferred number of rounds per game. ENTER NUMBERS ONLY: "); scanf("%d", &rounds); } while(isdigit(rounds) == 0); return 0; } 回答1: I

问题 I'd like to create a multidimensional array using a loop in jQuery/JS. Is it possible to use the next available key instead of setting it manually? jsonFromPhp contains something like this: 0 {first_name: "Tom", last_name: "Smith", location: "London"} 1 {first_name: "Max", last_name: "Muster", location: "Zurich"} 2 {first_name: "Joanne", last_name: "Kate", location: "London"} ... Here is the loop: jsonFromPhp.forEach((row, i) => { if (row['location'] == 'London') { firstKey = 0; } else {

问题 I'd like to create a multidimensional array using a loop in jQuery/JS. Is it possible to use the next available key instead of setting it manually? jsonFromPhp contains something like this: 0 {first_name: "Tom", last_name: "Smith", location: "London"} 1 {first_name: "Max", last_name: "Muster", location: "Zurich"} 2 {first_name: "Joanne", last_name: "Kate", location: "London"} ... Here is the loop: jsonFromPhp.forEach((row, i) => { if (row['location'] == 'London') { firstKey = 0; } else {

问题 I'm designing a simple quiz with PHP and would like to know if i'm approaching it the correct way before proceeding. The quiz will have approximately 25 questions, a mixture of radio buttons and checkboxes. The idea is to calculate the total and display this to the user when the quiz is submitted. I have just four questions so far. Questions 1 - 3 are radio buttons, one selection max. Question 4 is a checkbox and allows two selections max, each correct selection is worth 0.5 Here's a snippet