multidimensional-array

问题 I am trying to calculate the average value of columns in 2D array, but I cannot figure out the code. The function should return the average value of each column. And I cannot print the result in the function. The print should be in main function. static double average_columns(double matrix[][]) { int i, j, sum = 0, average=0; for (i = 0; i < matrix.length; i++) { for (j = 0; j < matrix[i].length; j++) { sum=(int) (sum+matrix[i][j]); } average=sum/matrix[i].length; sum=0; } return average; }

问题 I am trying to calculate the average value of columns in 2D array, but I cannot figure out the code. The function should return the average value of each column. And I cannot print the result in the function. The print should be in main function. static double average_columns(double matrix[][]) { int i, j, sum = 0, average=0; for (i = 0; i < matrix.length; i++) { for (j = 0; j < matrix[i].length; j++) { sum=(int) (sum+matrix[i][j]); } average=sum/matrix[i].length; sum=0; } return average; }

问题 I am trying to calculate the average value of columns in 2D array, but I cannot figure out the code. The function should return the average value of each column. And I cannot print the result in the function. The print should be in main function. static double average_columns(double matrix[][]) { int i, j, sum = 0, average=0; for (i = 0; i < matrix.length; i++) { for (j = 0; j < matrix[i].length; j++) { sum=(int) (sum+matrix[i][j]); } average=sum/matrix[i].length; sum=0; } return average; }

问题 I have a multi-dimensional array: array(3) { [0]=> array(2) { [0]=> string(3) "ABC" [1]=> string(3) "744" } [1]=> array(2) { [0]=> string(3) "DEF" [1]=> string(2) "86" } [2]=> array(2) { [0]=> string(3) "GHI" [1]=> string(1) "2" } } Now I want to convert the string-type values which are numbers to integer type. Ex 744 is string but it should be integer. I have tried a few functions after searching forums but with no success. Later I have to use this array in json_encode() function and in my

问题 Can someone please help me understand the following code? I'm new to java, I'm trying to learn Objects[]. This code compiles but retval does not return anything? I've done a lot of search online but can't find why is Object[3][] compiles and does not complain? What does the following code mean? (new Object[1])[0] = tt; How can "retval[0] = new Object[1];" compile if Object is two dimensional array. package Package1; import org.testng.annotations.Test; public class Test1 { @Test public void

问题 I need to write a a method in my code that can take a two dimensional array and return how many different groups there are within the array. A group is defined as, "all cells connected directly to other cells in the up/down/left/right (not diagonal) directions" where a cell in the array would be represented by an asterisk. I need to write a method that iterates through the entire array that also calls a recursive method that changes every asterisk into a letter that is unique to that group.

问题 For example we have this 2D list: list1 = [['tom',67,'engineer',2], ['ron',42,'scientist',4], ['alie',56,'doctor',3], ['rambo',29,'lawyer',7]] Now I have to delete rows in which column 4 has odd values. Is there any way in python3 to do this using pop or something else? 回答1: The easiest way it to create a new list from list1 . You can assign this to list1 if you wish to replace it. You can use: list2 = [v for v in list1 if v[3] % 2 == 0] In your example, list2 gets the following value: [['tom

问题 For example we have this 2D list: list1 = [['tom',67,'engineer',2], ['ron',42,'scientist',4], ['alie',56,'doctor',3], ['rambo',29,'lawyer',7]] Now I have to delete rows in which column 4 has odd values. Is there any way in python3 to do this using pop or something else? 回答1: The easiest way it to create a new list from list1 . You can assign this to list1 if you wish to replace it. You can use: list2 = [v for v in list1 if v[3] % 2 == 0] In your example, list2 gets the following value: [['tom

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . Improve this question I understand that the C language uses row-major order to store arrays, whereas MATLAB uses column-major order. Is there any specific reason for MATLAB choosing column-major order? Does MATLAB gain significantly by opting to arrange multidimensional arrays by

问题 I don't like uninitialized VBA arrays, since it's necessary to check if array is initialized, each time prior using UBound() or For Each to avoid an exception, and there is no native VBA function to check it. That is why I initialize arrays, at least doing them empty with a = Array() . This eliminates the need for extra check in most of cases, so there are no problems with 1d arrays. For the same reason I tried to create an empty 2d array. It's not possible simply do ReDim a(0 To -1, 0 To 0)