create a matrice in a for loop

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Miguel Albuquerque
Miguel Albuquerque 2022-7-11
评论： Miguel Albuquerque 2022-7-12
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?
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;
end
end
end
end
end

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回答（1 个）

Harshit Gupta
Harshit Gupta 2022-7-12
Hi, I understand that you want to push more data in column (i) of your distance_matrix.
Try something like this:
distance_matrix(:,i)=[distance_matrix(:,i), new_value]
This will create a vector in each cell of your matrix
Hope this helps!
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Stephen23
Stephen23 2022-7-12
distance_matrix=zeros(1,length(waypoints)); % defines a 1xN matrix.
distance_matrix(:,i) % refers to one column of a 1xN matrix, i.e. a 1x1 element.
[distance_matrix(:,i), R1+R2-Rd] % defines a 1x2 matrix.
How do you expect to fit two numbers into the space of one number?
distance_matrix=zeros(2,length(waypoints))
% ^
Miguel Albuquerque
Miguel Albuquerque 2022-7-12
Even if I define the first line as(2, length(waypoints)), it does the same error

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