Create a matrix of element (points) connectivity

Hiii

I am new to matlab, trying to create a 2D rectangular boxs with number of points as attached, with number of rectangular boxes

I also attached the code (it's only with 4 points) I would like to know how to make it with 9 points... or 16 points ?

clear all;

clc;

m=2; % m : number of points in x direction in each rectangular box

n=2; % n : number of points in y direction in each rectangular box

% Numbering

nel = m*n; % total number of elements (total number of rectangular box

elem = zeros(nel,9); % matrix of element connectivities

for I = 1:m

for J = 1:n

elem_num = J + (I-1)*n; % element counter

elem(elem_num,1) = J + (I-1)*(n+1); % node 1 % SHOULD ADD UNTIL NODE 9

elem(elem_num,2) = elem(elem_num,1) + (n+1); % node 2

elem(elem_num,3) = elem(elem_num,2) + 1; % node 3

elem(elem_num,4) = elem(elem_num,1) + 1; % node 4

% elem(elem_num,5) =; % node 5

%elem(elem_num,6) = ; % node 6

% elem(elem_num,7) = ; % node 7

% elem(elem_num,8) = ; % node 8

% elem(elem_num,9) = ; % node 9

end

end

% I would like to obtain elem =[1 3 4 2 5 6 7 8 9;3 10 11 4 12 13 14 6 15]

Answer 1

[Yongjian Feng]

Can you just change

m=3;
n=3;

for 9 ponts?

[sci hub]

@Yongjian Feng

Thank you for your reply. But I did not mean that..

m and n are the elements number

not the points.. as attached

I would like to obtain elem =[1 3 4 2 5 6 7 8 9;3 10 11 4 12 13 14 6 15]

Hope you get what I meant ??