multidimensional-array

问题 I want to group array values and find total (sum of array value-based of the group by value) and then sort array based on total. I want to group by users by fund type ("Private, VC, Others") and the sum of total fund ("last value") I have set up a demo link here. https://3v4l.org/6WNKE <?php $data = [ [ 'Jon', 'NO', "", "Private", 120 ], [ 'Andew', 'NO', "", "VC", 150 ], [ 'Walid', 'YES', "", "Other", 160 ], [ 'Andew', 'YES', "", "VC", 150 ], [ 'Andew', 'YES', "", "VC", 180 ], [ 'Jon', 'NO',

问题 I am adding elements to multidimensional array like this foreach($results as $res){ $fwidth=$res[0]; $fpath=$res[1]; $sub = array ( 'img_w' => $fwidth, 'img_path' => $fpath, ); $widths[] = $sub; } And i want to sort $widths array by 'img_w' from bigger to smaller (DESC). Can anyone help me? Thanks in advance. 回答1: Use PHP's USort() function (user sort), which takes two arguments. The first is the array you want to sort. The second is a function that does the actual sorting (you write it

问题 I recently switched from numpy to ND4J but had a hard time understanding how broadcasting in ND4J works. Say I have two ndarray, a of shape [3,2,4,5] and b of shape [2,4,5]. I would like to element-wise add them up and broadcast b to each a[i] for i = 0 to 2 . In numpy it can simply be done via a + b , while in ND4J a.add(b) throws an exception. I tried a.add(b.broadcast(3)) but still no luck. What is the correct way of doing this in ND4J? 回答1: The only method I have found so far is as

问题 I recently switched from numpy to ND4J but had a hard time understanding how broadcasting in ND4J works. Say I have two ndarray, a of shape [3,2,4,5] and b of shape [2,4,5]. I would like to element-wise add them up and broadcast b to each a[i] for i = 0 to 2 . In numpy it can simply be done via a + b , while in ND4J a.add(b) throws an exception. I tried a.add(b.broadcast(3)) but still no luck. What is the correct way of doing this in ND4J? 回答1: The only method I have found so far is as

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I am trying to figure out how to remove one main element and all its siblings and save the array afterwards. Here is what i got: $my_array = Array ( [0]

问题 In C#, it's possible to initialize a multidimensional array using constants like so: Object[,] twodArray = new Object[,] { {"00", "01", "02"}, {"10", "11", "12"}, {"20", "21", "22"} }; I personally think initializing an array with hard coded constants is kind of useless for anything other than test exercises. Anyways, what I desperately need to do is initialize a new multidimensional array as above using existing arrays. (Which have the same item count, but contents are of course only defined

问题 Code short **p = (short **)malloc(sizeof(short *)); *p = malloc(sizeof(short)); **p = 10; printf("**p = %d", **p); Output **p = 10 In this code, a multiple pointer **p is declared and *p is used without any declaration(maybe it's by **p ). What does *p mean in my case? Sorry for very simple question. I saw C standard and stack overflow, but I couldn't find out something. 回答1: For any array or pointer p and index i , the expression p[i] is exactly equal to *(p + i) (where * is the unary

问题 I am trying to get a data file of mine converted to something that Paraview can read. What I have found so far is that it needs to be converted to a VTK but I am not sure how to begin this. I have seen a bunch of answers but nothing relating to what I need. Here is what I have... I have a .dat file with 4 columns of numbers. x- coordinate, y- coordinate, z- coordinate, density at that point The code I am using is in fortran. Can someone please point me in the right direction. Can fortran

问题 I am trying to get a data file of mine converted to something that Paraview can read. What I have found so far is that it needs to be converted to a VTK but I am not sure how to begin this. I have seen a bunch of answers but nothing relating to what I need. Here is what I have... I have a .dat file with 4 columns of numbers. x- coordinate, y- coordinate, z- coordinate, density at that point The code I am using is in fortran. Can someone please point me in the right direction. Can fortran

问题 i have a code that create 2d array using user input and it work fine but now i have 2 questions the first one: how to convert 2d array to 1d array? second question: how to choose or trace the elements above the right diagonal in the 2d array? anyone can help me to fix this code? this my code package question3; import java.util.Arrays; import java.util.Collection; import java.util.Scanner; public class Array2d { public static void main(String[] args) { int[][] matrix = new int[3][3]; int[]