JavaScript nested for loops

I am new to coding. I need to create a code that prints a coordinate plane from (0,0) to (9,9). I then need to delete certain cells to make a diagonal line through the plane.

[darova]

Any ideas?

Answer 1

[Arjun]

Hi @Lu Ella,

I understand that you want to create a grid of co-ordinate points from (0,0) to (9,9) and then delete the diagonal elements to obtain the final grid.

In order to create a grid with co-ordinate points, since the grid is a 2-D grid you have to run 2 nested "for" loops or "while" loops to populate the grid entirely with the co-ordinate points and then after you have obtained this grid, again run a "for" loop to delete the elements on the primary and secondary diagonals. To identify primary and secondary diagonal elements use the following equations:

• Primary Diagonal: Elements with co-ordinates (i,i)
• Secondary Diagonal : Elements with co-ordinates (i,gridSize-i+1)

Note: "i" is the loop control variable.

Kindly refer to the code below for better understanding:

gridSize = 10;
% Initialize the grid with coordinate tuples
grid = strings(gridSize, gridSize);
% Fill the grid with coordinate tuples
for x = 1:gridSize
    for y = 1:gridSize
        % MATLAB uses 1-based indexing, adjust to 0-based
        grid(x, y) = sprintf('(%d,%d)', x-1, y-1); 
    end
end
% Remove cells to create both diagonals
for i = 1:gridSize
    grid(i, i) = "     "; % Main diagonal
    grid(i, gridSize - i + 1) = "     "; % Secondary diagonal
end
% Display the modified grid
disp('Grid with Both Diagonals Removed:');

Grid with Both Diagonals Removed:

for i = 1:gridSize
    disp(grid(i, :));
end

    "     "    "(0,1)"    "(0,2)"    "(0,3)"    "(0,4)"    "(0,5)"    "(0,6)"    "(0,7)"    "(0,8)"    "     "

    "(1,0)"    "     "    "(1,2)"    "(1,3)"    "(1,4)"    "(1,5)"    "(1,6)"    "(1,7)"    "     "    "(1,9)"

    "(2,0)"    "(2,1)"    "     "    "(2,3)"    "(2,4)"    "(2,5)"    "(2,6)"    "     "    "(2,8)"    "(2,9)"

    "(3,0)"    "(3,1)"    "(3,2)"    "     "    "(3,4)"    "(3,5)"    "     "    "(3,7)"    "(3,8)"    "(3,9)"

    "(4,0)"    "(4,1)"    "(4,2)"    "(4,3)"    "     "    "     "    "(4,6)"    "(4,7)"    "(4,8)"    "(4,9)"

    "(5,0)"    "(5,1)"    "(5,2)"    "(5,3)"    "     "    "     "    "(5,6)"    "(5,7)"    "(5,8)"    "(5,9)"

    "(6,0)"    "(6,1)"    "(6,2)"    "     "    "(6,4)"    "(6,5)"    "     "    "(6,7)"    "(6,8)"    "(6,9)"

    "(7,0)"    "(7,1)"    "     "    "(7,3)"    "(7,4)"    "(7,5)"    "(7,6)"    "     "    "(7,8)"    "(7,9)"

    "(8,0)"    "     "    "(8,2)"    "(8,3)"    "(8,4)"    "(8,5)"    "(8,6)"    "(8,7)"    "     "    "(8,9)"

    "     "    "(9,1)"    "(9,2)"    "(9,3)"    "(9,4)"    "(9,5)"    "(9,6)"    "(9,7)"    "(9,8)"    "     "

Kindly refer to the documentation of "for" loops for better understanding: https://www.mathworks.com/help/releases/R2021a/matlab/ref/for.html

I hope this will help!