What is an efficient way to shrink a two dimensional array to a smaller size in C#? For example: var bigArray = new object[100, 100]; var smallArray = new object[10, 10]; bigArray[0, 0] = 1; bigArray[0, 1] = 2; ... bigArray[99, 99] = 100000; startRowIndex = 0; startColumnIndex = 0; endRowIndex = 9; endColumnIndex = 9; smallArray = ...
I have just noticed that a multidimensional array in C#, does not implement IEnumerable<T>, while it does implement IEnumerable. For single-dimensional arrays, both IEnumerable<T> and IEnumerable is implemented. Why this difference ? If a multi-dimensional array is IEnumerable, surely it should also implement the generic version ? I no...
How can I deep copy an irregularly shaped 2D array in Java? Ie. int[][] nums = {{5}, {9,4}, {1,7,8}, {8,3,2,10}} I'm unable to use Arrays.arrayCopy() for some reason (versioning?) Thanks ...
It's probably beginner question but I'm going through documentation for longer time already and I can't find any solution. I thought I could use implode for each dimension and then put those strings back together with str_split to make new simple array. However I never know if the join pattern isn't also in values and so after doing str_...
I have an app that shows store sales. It is a multi-dimensional array, so each value in the root array is an array containing [sales], [cost], [date], etc. for the given day it pertains to. OK, there are 2 arrays for each store. One is for verified numbers and the next is for unverified numbers. The unverified picks up right after the ve...
Hi, I got a table (in file) which I split into blocks by spaces. I need structure like this: ----------------------------- |21|22|23|33|3323| |32|32| |434433|545454|5454| ------------------------------ It's more like each row is its own table. How should I do this? I tried List<List<string>> matrix = new List<List<string>>(); but I...
I want to use a data structure for sorting space-time data (x,y,z,time). Currently a processing algorithm searches a set of 4D (x,y,z,time) points, given a spherical (3d) spacial radius and a linear (1d) time radius, marking for each point, which other points are within those radii. The reason is that after processing, I can ask any 4D ...
I'm looking to be able to sort an array of multi-dimensional arrays on more than one column. To further complicate it I'd like to be able to set specific sort options per key/column. I have what is similar the result of a DB query, but doesn't actually come from one, therefore the need to sort it in PHP rather than SQL. Array ( [0] ...
How can I take a multi-dimensional array like the below, and split it into multiple separate arrays? Additional challenge: Although I know there are two pairs in the example below (pageviews, visits), how can you do it assuming that you don't know the number of pairs in the array? For example, I may want to add "time on page" or "pages v...
I have a large table of N items with M (M>=3) distinct properties per item, From this table I have to remove all items for which the same table contains an item that scores equal or better on all properties. I have an algorithm (python) that solves it already, but it is output-sensitive and has a worst case of approx. O((n²+n)/2) when n...
Normally I'd be asking how to turn something like this: 1 2 3 4 5 6 7 8 9 10 11 12 Into this: 1 4 7 10 2 5 8 11 3 6 9 12 But actually I want to turn it into this: 1 5 9 2 6 10 3 7 11 4 8 12 In other words, I want to flip the rows and columns, but keep...
Hi, i was wondering what is the best way to generate an MD5 (or any other hash) of a multi-dimensional array? I could easily write a loop which would traverse through each level of the array, concatenating each value into a string, and simply performing the MD5 on the string. However, this seems cumbersome at best and i wondered if t...
Hi, What I want, is a function that searches through my array, and returns all the children to a specific node. What is the most appropriate way to do this? Will recursion be necessary in this case? I have previously constructed a few quite complex functions that iterates with or without the help of recursion through multi-dimensiona...