loops

问题 Here's the question I've been given: Create a 4X3 integer array and fill it, column by column using loops, with the odd numbers starting with 1. In a separate, one dimensional array, store the average of each column of the 4X3 array. Output the 4X3 array (as a 4X3 array) and output the average of each column underneath each column. Label these as the average. I just learned that I can make an array like this: N[4][3] , but should I even do that here? I feel like setting up an array for each

问题 Here's the question I've been given: Create a 4X3 integer array and fill it, column by column using loops, with the odd numbers starting with 1. In a separate, one dimensional array, store the average of each column of the 4X3 array. Output the 4X3 array (as a 4X3 array) and output the average of each column underneath each column. Label these as the average. I just learned that I can make an array like this: N[4][3] , but should I even do that here? I feel like setting up an array for each

问题 I want to speed up a function for creating a pairwise matrix that describes the number of times an object is selected before and after all other objects, within a set of locations. Here is an example df : df <- data.frame(Shop = c("A","A","A","B","B","C","C","D","D","D","E","E","E"), Fruit = c("apple", "orange", "pear", "orange", "pear", "pear", "apple", "pear", "apple", "orange", "pear", "apple", "orange"), Order = c(1, 2, 3, 1, 2, 1, 2, 1, 2, 3, 1, 1, 1)) In each Shop , Fruit is picked by a

问题 i'm currently learning x86 assembly language and wondered what is the better way for implementing loops. One way would be to mov a value to ecx register and use the loop instruction and the other way would be using a jmp instruction and then comes the loop body and then a conditional jumping eventually to the beginning of the loop body. I guess the first one will has a better readability but other then that i don't know why to use it. 回答1: When you mention jmp+body+test, I believe you are

问题 i'm currently learning x86 assembly language and wondered what is the better way for implementing loops. One way would be to mov a value to ecx register and use the loop instruction and the other way would be using a jmp instruction and then comes the loop body and then a conditional jumping eventually to the beginning of the loop body. I guess the first one will has a better readability but other then that i don't know why to use it. 回答1: When you mention jmp+body+test, I believe you are

问题 i'm currently learning x86 assembly language and wondered what is the better way for implementing loops. One way would be to mov a value to ecx register and use the loop instruction and the other way would be using a jmp instruction and then comes the loop body and then a conditional jumping eventually to the beginning of the loop body. I guess the first one will has a better readability but other then that i don't know why to use it. 回答1: When you mention jmp+body+test, I believe you are

问题 i'm currently learning x86 assembly language and wondered what is the better way for implementing loops. One way would be to mov a value to ecx register and use the loop instruction and the other way would be using a jmp instruction and then comes the loop body and then a conditional jumping eventually to the beginning of the loop body. I guess the first one will has a better readability but other then that i don't know why to use it. 回答1: When you mention jmp+body+test, I believe you are

问题 i'm currently learning x86 assembly language and wondered what is the better way for implementing loops. One way would be to mov a value to ecx register and use the loop instruction and the other way would be using a jmp instruction and then comes the loop body and then a conditional jumping eventually to the beginning of the loop body. I guess the first one will has a better readability but other then that i don't know why to use it. 回答1: When you mention jmp+body+test, I believe you are

问题 Which is more pythonic? While loop: count = 0 while count < 50: print "Some thing" count = count + 1 For loop: for i in range(50): print "Some thing" Edit: not duplicate because this has answers to determine which is clearer, vs. how to run a range without 'i' -- even though that ended up being the most elegant 回答1: Personally: for _ in range(50): print "Some thing" if you don't need i . If you use Python < 3 and you want to repeat the loop a lot of times, use xrange as there is no need to

问题 Which is more pythonic? While loop: count = 0 while count < 50: print "Some thing" count = count + 1 For loop: for i in range(50): print "Some thing" Edit: not duplicate because this has answers to determine which is clearer, vs. how to run a range without 'i' -- even though that ended up being the most elegant 回答1: Personally: for _ in range(50): print "Some thing" if you don't need i . If you use Python < 3 and you want to repeat the loop a lot of times, use xrange as there is no need to