将一维数组的索引转换为二维数组 [英] converting the index of 1D array into 2D array

问题描述

如何将1D数组的索引转换为2D数组?我知道如何将2D数组转换为1D (i * row + j的大小).我想要相反的东西.

How can I convert the index of 1D array into 2D array? I know how to convert a 2D array into 1D (i*the size of row+j). I want the opposite of that.

推荐答案

您需要知道的是:2D数组应具有多少列:假设您有一个20列10行的数组(array [20,10]):

What you need to know is: How many columns should the 2D array have: Lets say you have an array of 20 columns and 10 rows (array[20,10]):

int index  = 47;
int numberOfColumns = 20;
int column = index % numberOfColumns;
int row    = index / numberOfColumns;

// column == 7
// row    == 2

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