I am working with a two-dimensional array, matrix[2][2], that I have stored in a list:
var list= ["a","b","c","d"];
In addition to the list, I also have two specific coordinates:
var x = 0;
var y = 1;
My goal is to retrieve the element at position (x,y) from the list, for example: (x,y)==(0,1) which corresponds to the letter c.
Can anyone advise me on how to achieve this?
The fictitious matrix depicts the following structure:
a b
c d
The equation you need to use is:
position = row * totalColumns + column;
In this equation, row represents the row index and column represents the column index.
For your specific scenario (assuming there are 2 columns), the calculation would be:
let element = array[row * 2 + column];
Note: In my explanation, I refer to column as the horizontal position and row as the vertical position, which I believe is the more precise terminology. If your setup has it the other way around (column is the row and row is the column), then simply interchange column and row in the formula.
Example:
const array = ["apple", "banana", "cherry", "date"];
let column, row;
column = 0; row = 0;
console.log("(" + column + ", " + row + ") = " + array[row * 2 + column]);
column = 1; row = 0;
console.log("(" + column + ", " + row + ") = " + array[row * 2 + column]);
column = 0; row = 1;
console.log("(" + column + ", " + row + ") = " + array[row * 2 + column]);
column = 1; row = 1;
console.log("(" + column + ", " + row + ") = " + array[row * 2 + column]);Give this a shot:
function access_xy_values(my_list, x_index, y_index)
{
var temp = []
temp.push(my_list.slice(0, 2), my_list.slice(2, 4))
return temp[x_index][y_index];
}
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