for-loop

问题 I try to combine each columns of three different dataframes to get an object with the same length of the original dataframe and three columns of every subobject. Each of the original dataframe has 10 columns and 14 rows. I tried it with a for-loop, but the result is not usable for me. t <- NULL for(i in 1 : length(net)) { a <- cbind(imp.qua.00.09[i], exp.qua.00.09[i], net[i]) t <- list(t, a) } t But in the end I would like to get 10 seperated dataframes with three columns. So I want to loop

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Recently, by the kind response of a stackoverflow member, I learnt how to perform operations on meshgrids with functions that weren't contiguous with with numpy using a for-loop trick to iterate over each of the elements in the grid. I found that it worked on most occasions however, below, for some reason it

问题 I'm using the below code and I want to get all Href in the elements not just first Href but when I use it I got only the first Href communities = driver.find_elements_by_css_selector('div.coin-link-row:nth-child(4) > div:nth-child(2)>a') sources = driver.find_elements_by_css_selector('div.coin-link-row:nth-child(5) > div:nth-child(2)>a') with open('example2.csv', 'a') as myFile: writer = csv.writer(myFile) for community, source in zip(communities, sources): writer.writerow([ community.get

问题 please do let me know if this question is too general. I'm trying to implement a for loop with a nested for loop. Every time the for loop runs, it will either print two integer values or next onto the next iteration. As a result, I have outputs from the for loop that looks like this: [1] 10 57 [1] 10 58 [1] 10 59 [1] 10 63 [1] 10 64 [1] 10 67 [1] 10 68 [1] 10 69 [1] 10 70 [1] 10 71 [1] 10 72 [1] 10 75 [1] 10 76 [1] 10 77 [1] 10 78 [1] 10 79 [1] 10 80 [1] 10 82 [1] 10 86 [1] 10 87 [1] 10 90 I

问题 I have a program simulating a BMI (Body Mass Index) Calculator that takes in inputs from 10 users asking each user for a weight and a height, the program then calculates the BMI and prints the result of the computation in a formatted output. Something like this: USER BMI STATUS 1 : 10 So I thought of this, I would take in the inputs from the users first, then try to display the computation of the inputs in the above formatted way. Here's what I've tried to come up with which keeps asking the

问题 This is what works: const limit = 1000 // fetchMyProducts(page, limit, flag) return fetchMyProducts(1, 1, true) .then(function (products) { return fetchMyProducts(2, limit, false) }).then(function (totalProducts) { return fetchMyProducts(3, limit, false) }).then(function (totalProducts) { return fetchMyProducts(4, limit, false) }).then(function (totalProducts) { return fetchMyProducts(5, limit, false) }).then(function (totalProducts) { return fetchMyProducts(6, limit, false) }).then(function

问题 We have an old-style for loop to add custom objects to ArrayList. public List<Object> generateList() { List<Object> list = new ArrayList<Object>(); for (int i = 0; i < 10; i++) { list.add(new Manager(50000, 10, "Finance Manager")); list.add(new Employee(30000, 5, "Accounts")); } return list; } Is there any way to do this by using java8? I tried to use Stream.generate(MyClass::new).limit(10); but, I am not getting the right way in java8 to achieve the above functionality. Any suggestions,

问题 We have an old-style for loop to add custom objects to ArrayList. public List<Object> generateList() { List<Object> list = new ArrayList<Object>(); for (int i = 0; i < 10; i++) { list.add(new Manager(50000, 10, "Finance Manager")); list.add(new Employee(30000, 5, "Accounts")); } return list; } Is there any way to do this by using java8? I tried to use Stream.generate(MyClass::new).limit(10); but, I am not getting the right way in java8 to achieve the above functionality. Any suggestions,

问题 I am looking for a way to call different variables dynamically. Like, if I've got variables a1, a2, and a3 in a for loop, and I want to use a different one each time. Something like: a1 = "Good Morning" a2 = "Good Afternoon" a3 = "Good Night" for (i in 1:3){ paste("a" & i) } That paste line doesn't work, and that's what I'm looking for. A way to combine "a" and i so it reads as the variable a1, then a2, then a3. 回答1: Yet another answer with mget , but determining the "a" variables that exist

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Could not allocate memory My following code runs fine: double weight [600] [800][3]; double mean [600] [800][3]; double sd [600] [800][3]; double u_diff [600] [800][3]; for ( int i = 0; i < 600; i ++ ) { for ( int j = 0; j < 800; j ++ ) { for ( int k=0; k < 3; m ++ ) { weight [i][j][k] = 0; mean[i][j][k] = 0; sd[i][j][k] = 6; } } } But when I change it into this form: int init = 6; int C = 3; for ( int i = 0; i