double indexed variable (new user)

I am very new to Matlab. I am trying to create ixj number of variables using the function below. I am getting an error message for pos(i,j) = [b/2+partsize/2+(i-1)*(b+partsize), b/2+partsize/2+(j-1)*(b+partsize)] line. How do I create indexed variables that I can call later in Matlab? Here pos(i,j)==> 1x2 vector (x and y coordinates) e.g I expect to obtain something like the following: pos (1,1)= [ 2 2] pos ( 1,2) = [2 4] pos ( 2,1) = [4 2] pos (2, 2) = [4 4] etc.

function b= posgen(cellsize, particleno, partsize)
partnoline =(particleno)^(1/2);
b= (cellsize-partnoline*partsize)/partnoline;

for i=1:partnoline;
    for j=1:partnoline;
    pos(i,j)  = [b/2+partsize/2+(i-1)*(b+partsize), b/2+partsize/2+(j-1)*(b+partsize)]
    end
end

What am I doing wrong? Can you help please

[Unknowndruid]

To make it simpler,

for i=1:n

for j=1:m

pos(i,j)=[n^2, m]

end

end

I want to create indexed variables and want to able to recall them their indexes with pos (2,3) or pos (1,5) etc.

Answer 1

[Walter Roberson]

Numeric arrays cannot have multiple elements (e.g., x and y) at a location. Use an additional dimension, or use cell arrays.

pos(i,j,:)  = [b/2+partsize/2+(i-1)*(b+partsize), b/2+partsize/2+(j-1)*(b+partsize)];

[Unknowndruid]

Thanks for rapid response!

I got the following error with the suggested change:

"Expression or statement is incomplete or incorrect."

[Unknowndruid]

sorry my bad. It worked!!

But not the way I wanted:(

pos(:,:,1) =

2.5000

pos(:,:,2) =

2.5000

pos(:,:,1) =

2.5000 2.5000

pos(:,:,2) =

2.5000 7.5000

pos(:,:,1) =

2.5000 2.5000

7.5000 0

pos(:,:,2) =

2.5000 7.5000

2.5000 0

pos(:,:,1) =

2.5000 2.5000

7.5000 7.5000

pos(:,:,2) =

2.5000 7.5000

2.5000 7.5000

[Unknowndruid]

Ok. I think that I am too new to understand the significance of this outcome. I now understand that I can recall pos (1,2,2) etc.