multidimensional-array

问题 I'm trying to write some dimension-independent code for a template class in c++, using a boost::multi_array (though if other containers/data structures are better at this, I'd be happy to hear about it). Given a dimension, I would like to iterate over the full range of every other dimension, returning a 1d view along the selected dimension. This is fairly straightforward, or at least it appears to be from the boost documentation. What I can't figure out how to do is iterate the selected

问题 I am creating an order form that has a table of order items users can purchase. The inputs are using data attributes to store the items name and price per piece like so: <input type="text" class="input-small quantity-input" data-pid="<?php echo $p['id']; ?>" data-min="<?php echo $p['min_qty']; ?>" data-max="<?php echo $p['max_qty']; ?>" data-price="<?php echo $p['price']; ?>" data-name="<?php echo $p['product_name']; ?>" placeholder="quantity..."> I have everything figured out except for how

问题 I am using arrays to store properties of steam according to it's pressure. Right now I have properties of exactly 9 pressures so I'm using static array. I'd like to be more flexible so I'd like to switch to dynamic arrays. When I use ReDim foo(1 to i, 1 to 10) in loop I completely loose all data except last line. When I use ReDim Preserve foo(1 to i, 1 to 10) or ReDim Preserve(i,10) Program throws error of "Runtime error '9': subscript out of range" . i goes from 1 to 9. How can I add line

问题 I'm trying to make advanced search filters in an application that holds resources (people). I've got all the results in 1 multidimensional array. A user of the application can search for the persons Job title, skills, work field and country. I've already made the part where I look up the people that meet the criteria given by the user. These results are stored in a multidimensional array. If the user is looking for someone with a specific resource with a job title and a specific skill the

问题 This question builds off of a previously asked question: Pass by reference multidimensional array with known size I have been trying to figure out how to get my functions to play nicely with 2d array references. A simplified version of my code is: unsigned int ** initialize_BMP_array(int height, int width) { unsigned int ** bmparray; bmparray = (unsigned int **)malloc(height * sizeof(unsigned int *)); for (int i = 0; i < height; i++) { bmparray[i] = (unsigned int *)malloc(width * sizeof

问题 How can I check if a key exists in the sub keys of an array? And if that key of the item is found then return that item? For instance, I have this array, Array ( [0] => Array ( [a] => Array ( [quantity_request] => 1 [time_created] => 1339688613 [variant] => Array ( ) ) ) [1] => Array ( [b] => Array ( [quantity_request] => 1 [time_created] => 1339688631 [variant] => Array ( ) ) ) [2] => Array ( [c] => Array ( [quantity_request] => 1 [time_created] => 1339688959 [variant] => Array ( ) ) ) ) I

问题 How can I check if a key exists in the sub keys of an array? And if that key of the item is found then return that item? For instance, I have this array, Array ( [0] => Array ( [a] => Array ( [quantity_request] => 1 [time_created] => 1339688613 [variant] => Array ( ) ) ) [1] => Array ( [b] => Array ( [quantity_request] => 1 [time_created] => 1339688631 [variant] => Array ( ) ) ) [2] => Array ( [c] => Array ( [quantity_request] => 1 [time_created] => 1339688959 [variant] => Array ( ) ) ) ) I

问题 A variation of "Searching in a Matrix that is sorted rowwise and columnwise" Given a 2D Matrix that is sorted rowwise and columnwise. You have to return the count of negative numbers in most optimal way. I could think of this solution initialise rowindex=0 if rowindex>0 rowindex++ else apply binary search And implemented in with this code for 5X5 matrix #include<iostream> #include<cstdio> using namespace std; int arr[5][5]; int func(int row) { int hi=4; int lo=0; int mid=(lo+hi)/2; while(hi>

问题 I have a function declared like so: unsigned char** Classifier::classify(){ //... unsigned char **chars = new unsigned char *[H]; for(int i = 0; i < H; i++) chars[i] = new unsigned char[W*3]; //... return &chars; //note: when this is "return chars;" I get the following: cannot convert ‘unsigned char*’ to ‘unsigned char**’ in return This is giving me the warning: Classifier.cpp: In member function ‘unsigned char** Classifier::classify()’: Classifier.cpp:124: warning: address of local variable

问题 I have a function declared like so: unsigned char** Classifier::classify(){ //... unsigned char **chars = new unsigned char *[H]; for(int i = 0; i < H; i++) chars[i] = new unsigned char[W*3]; //... return &chars; //note: when this is "return chars;" I get the following: cannot convert ‘unsigned char*’ to ‘unsigned char**’ in return This is giving me the warning: Classifier.cpp: In member function ‘unsigned char** Classifier::classify()’: Classifier.cpp:124: warning: address of local variable