Create a matrix for data with various iterations

hey to all, thanks for reading this in advance. I want to calculate Surveillance_SignalFD and Reference_SignalFD as a matrix, where each rows corresponds to a different y_transmitter. The code I have, for each y_transmitter it calculates this variables, but on the next iteration it replaces the values of the previous one. I want to save all the values of each iteration in a matrix.

Thanks guys

for i=1:numel(waypoints)
    Y_transmitter = waypoints(i);
    for xx=1:200
        for yy=1:200
            if AoI(xx,yy) ~= 0 % Target detection
                X_target= xx;
                Y_target= yy;
                Surveillance_SignalFD=(1/(R1+R2))*X_QPSK.*exp(-1*j*k0*(R1+R2)); % Surveillance Signal frequency domain
                Reference_SignalFD=(1/Rd)*X_QPSK.*exp(-1*j*k0*Rd); % Reference Signal frequency domain
                

Answer 1

[Rangesh]

Hello Miguel,

I understand that you want to save the values of every iteration in a matrix. To achieve it, you can follow the steps below:

1. Create a zero matrix with the preallocated size - numel(waypoints)x200x200 as follows:

Surveillance_SignalFD=zeros(numel(waypoints),200,200)  
Reference_SignalFD=zeros(numel(waypoints),200,200)   

2.Store the values by assigning the elements of the matrix as follows:

Surveillance_SignalFD(i,xx,yy)=(1/(R1+R2))*X_QPSK.*exp(-1*j*k0*(R1+R2)); % Surveillance Signal frequency domain 
Reference_SignalFD(I,xx,yy)=(1/Rd)*X_QPSK.*exp(-1*j*k0*Rd); % Reference Signal frequency domain 

You can refer to the following MATLAB Documentations of “numel”, “matrices and arrays” and “zeros” for more information:

• numel: https://www.mathworks.com/help/releases/R2021b/fixedpoint/ref/numel.html
• zeros: https://www.mathworks.com/help/releases/R2021b/matlab/ref/zeros.html
• matrices and arrays: https://www.mathworks.com/help/releases/R2021b/matlab/matrices-and-arrays.html

I hope this resolves your query.

Thanks,

Rangesh.