multidimensional-array

问题 I have an array in the following format: Array ( [0] => Array ( [0] => a [1] => b [2] => c ) [1] => Array ( [0] => d [1] => e [2] => f ) [2] => Array ( [0] => 0 [1] => 0 [2] => 0 ) [3] => Array ( [0] => 100 [1] => 200 [2] => 300 ) ) The indices in the first array(outer), i.e. 0 is for name, 1 for type, 2 for error and 3 for size. I have to rearrange this array in the following format: Array ( [0] => Array ( [name] => a [type] => d [error] => 0 [size] => 100 ) [1] => Array ( [name] => b [type]

问题 I want to implement multi-dimensional array using single array or vector, which can be accessed like usual multi-dimensional array(ex: a[1][2][3] ). Where I am stuck at is how to implement [ ] operator. If the dimension of an array is 1, then a[1] should return the element which is located at index 1. But what if the dimension is more than one? In case of nested vector,say 3-dimensinal vector, vec[1] will return vector<vector<some type> > . The reason why I am trying to implement my own multi

问题 I want to implement multi-dimensional array using single array or vector, which can be accessed like usual multi-dimensional array(ex: a[1][2][3] ). Where I am stuck at is how to implement [ ] operator. If the dimension of an array is 1, then a[1] should return the element which is located at index 1. But what if the dimension is more than one? In case of nested vector,say 3-dimensinal vector, vec[1] will return vector<vector<some type> > . The reason why I am trying to implement my own multi

问题 I have the following array: Array ( [0] => Array ( [Country] => Americas [Out_Count] => 14 ) [1] => Array ( [Country] => Belgium [Out_Count] => 2 ) [2] => Array ( [Country] => China [Out_Count] => 33 ) [3] => Array ( [Country] => France [Out_Count] => 7 ) ) I have a variable as follows: $los = 'Belgium'; What I'd like to do is search the array and bring back the value of Out_Count to a variable. I can use the following: $key = array_search($los, array_column($outs, 'Country')); This brings

问题 I've been having a little trouble trying to flatten arrays in a specific way. Here is a print_r view of the array I want to flatten: Array ( [1] => Array ( [8] => 1 [9] => 2 [10] => Array ( [15] => Array ( [22] => 1 ) [21] => 2 ) [11] => Array ( [16] => Array ( [23] => 1 ) ) ) [2] => Array ( [12] => 1 ) [3] => Array ( [13] => 1 ) [4] => Array ( [14] => 1 ) [5] => 5 [6] => 6 [7] => 7 ) What I'm attempting to create is an array which keeps the above indexes, but the value is equal to it's

问题 Problem: Given a multidimensional array, shuffle its elements in some selected dimensions. Ideally, the array should be shuffled in situ / in place , because a second one might not fit into my memory. For example, given an array a with 4 dimensions, assign to each a[x,y,z,] another value a[x2,y2,z2,] for all x,y,z , where x2,y2,z2 are chosen randomly from the set of indices of their respective dimension. Example array: set.seed(1) a <- array(data=sample(1:9, size=3*3*3*2, replace=T), dim=c(3

问题 I have a 2d array: [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'food'], []] How do I call a value from it? For example I want to print (name + " " + type) and get shotgun weapon I can't find a way to do so. Somehow print list[2][1] outputs nothing, not even errors. 回答1: >>> mylist = [[], ['shotgun', 'weapon'], ['pistol', 'weapon'], ['cheesecake', 'f ood'], []] >>> print mylist[2][1] weapon Remember a couple of things, don't name your list, list... it's a python reserved

问题 There are so many modules for serializing data for Perl, and I don't know which one to choose. I've the following data that I need to serialize as a string so I can put it in the database: my @categories = ( ["Education", "Higher Education", "Colleges"], ["Schooling", "Colleges"] ); How could I turn it into text, and then later when I need it, turn back into an array of array-references? 回答1: I vote for JSON (or Data::Serializer as mentioned in another answer, in conjunction with JSON ). The

问题 What I am trying to do right now is: x = x[:, None, None, None, None, None, None, None, None, None] Basically, I want to expand my Numpy array by 9 dimensions. Or some N number of dimensions where N might not be known in advance! Is there a better way to do this? 回答1: One alternative approach could be with reshaping - x.reshape((-1,) + (1,)*N) # N is no. of dims to be appended So, basically for the None's that correspond to singleton dimensions, we are using a shape of length 1 along those

问题 I have 3 arrays for storing posts,comments, and likes. These are the JSON strings: //comments JSON (stores user and comment points) $comments='[ { "user": "5", "points": "12" }, { "user": "2", "points": "1" }, { "user": "3", "points": "1" } ]'; //likes(stores user and likes point) $likes='[ { "user": "1", "points": 7 }, { "user": "4", "points": 4 }, { "user": "3", "points": 1 } ]'; //posts (stores user and post points) $posts='[ { "user": "1", "points": "6" }, { "user": "3", "points": "2" },