Create a matrice in a for loop

Hey guys, thanks in advance,

I have this moving radar, that detects targets in a specific area, identified by pixels(xtarget,ytarget).

In the end I have this distance_matrix, where rows are the distance to the target(R1-R2-Rd) and the columns are the position of the radar, since this radar is moving.

waypoints are the position of the radar, and it has, 400 positions(1:400 pixels). But the distance_matrix I have, saves the distances in 1 x 400, whic is correct, but if I have more than 1 target in each column(i), this code only saves one distance. I wanted that distance_matrix was a matrix that if column (i) had more that one distance to save, saved all the distances along that column. So imagine i=200, and in i there are 3 distances to save, so in i=200, distance_matrix should be 3x1 , and not 1x1 like I have, can you help me?

this image is a example when I run the code:

in waypoint=141, the radar detects target(100,325) and target(150,300), but when I go to distance_matrix, this has only one value of R1+R2-Rd, I want it to have two in this case

distance_matrix=zeros(1,length(waypoints)); % Define distance Signal matrix
R1_matrix=zeros(1,length(waypoints)); % Define distance Signal matrix
Rm_matrix=zeros(1,length(waypoints)); % Define distance Signal matrix
R2_matrix=zeros(1,length(waypoints)); % Define distance Signal matrix


for i=1:numel(waypoints) % For each waypoint
    Y_transmitter = waypoints(i);
    for xx=1:400
        for yy=1:400
            if AoI(xx,yy) ~= 0 % Target detection
                ....
                    if status ==1 & Pt ==1 & Pr ==1  & Wi_Surv ~=0 & Wi_transmit ~=0  % SAR Passive detection
                    ....
                        R1=sqrt( (X_transmitter-X_target).^2 + (Y_transmitter-Y_target).^2); % Distance transmitter-target in meters
                    R2=sqrt( (X_receiver-X_target).^2 + (Y_receiver-Y_target).^2); % Distance Receiver-target in meters
                    Rd=sqrt( (X_receiverref-X_transmitter).^2 + (Y_receiverref-Y_transmitter).^2); % Distance Transmitter-Receiver in meters
                    distance_matrix(:,i)=R1+R2-Rd;
                    R1_matrix(:,i)=R1;
                    R2_matrix(:,i)=R2;
                    Rm_matrix(:,i)=X_transmitter-X_target;
                    
                    
                    end
            end
        end
    end
end

[KALYAN ACHARJYA]

"I wanted that distance_matrix was a matrix that if column (i) had more that one distance to save, saved all the distances along that column."

...

You may look for cell array , where rows are the distance to the target & columns are the position of the radar. In that case you can save multiple data points in same distance & position.

Am I understanding the question correctly?

[Miguel Albuquerque]

I thought of doing this

distance_matrix=cell(2,length(waypoints));

How can I solve this

for ....
        distance_matrix(:,i)=R1+R2-Rd;
    But i get this error:
    Conversion to cell from double is not possible.

And I need to make the calculation in double, for the code that comes next