How can I change zeros matrix to 1 by specific points??

I have 8X8 Zeros matrix :

A = zeros(8, 8);

I need to create a multiple rectangles of Ones matrix. when I have specific points location:

first rectangular startfrom point [1,1] which are (X0, Y0) to [3,3] which are (X1, Y2).

and

second rectangular start from point [5,5] which are (X0, Y0) to [8,8] which are (X1, Y2).

I have try this but does not work with me:

%%first rectangular

A(([1,1]:[3,1]):([3,1]:[3,3]))= 1

%%second rectangular

A(([5,5]:[8,5]):([8,5]:[8,8]))= 1

Could you please help me.

Answer 1

[Adam Danz]

Here's a demo. When [x0,y0] is [4,3] and [x1,y1] is [6,7], a rectangle of 1 will be placed in matrix A in rows 3:7 from the top and columns 4:6 from the left.

See inline comments for details.

% Create 0s matrix
A = zeros(8, 8);

% Define [x0,y0] and [x1,y1]
x0 = 4; 
y0 = 3; 
x1 = 6; % x1 >= x0
y1 = 7; % y1 >= y0

% replace section with 1s
[y,x] = meshgrid(x0:x1, y0:y1); 
idx = sub2ind(size(A),x,y); 
A(idx) = 1

Result

A =
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     0     0     0     1     1     1     0     0
     0     0     0     1     1     1     0     0
     0     0     0     1     1     1     0     0
     0     0     0     1     1     1     0     0
     0     0     0     1     1     1     0     0
     0     0     0     0     0     0     0     0

If you'd rather use logicals, replace zeros() with false() and replace A(idx) = 1 with A(idx) = true.

Answer 2

[Andrei Bobrov]

A = zeros(8, 8);
A(1:3,1:3) = 1;
A(5:8,5:8) = 1;

[Mohammed Alammar]

thank you i have a spicific point which is etract from other code.