matlab out of memory problem

Question

Gophela Seiphepi 2022-12-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1882517-matlab-out-of-memory-problem

评论： Gophela Seiphepi 2022-12-27

I have tried reducing everything to fix the error, the code works fine until I add the receiver(rxs) to compute the coverage map. When i add rxs to coverage it says that matlab is out of memory. I am not very skilled in matlab and would like to practice until i get very good at it so any help would be greatly appreciated. Thanks in advance

clc;
close all; 
clearvars;
f0 = 2.4e9;
ant = helix('Tilt',-360);
f = figure;
show(ant)
view(-220,30)
z = -15;
x = (-250:4:250)*1e3;
y = (-100:4:400)*1e3;
[X,Y] = meshgrid(x,y);
numpoints = length(x)*length(y);
points = [X(:)'; Y(:)'; z*ones(1,numel(X))];
E = EHfields(ant,f0,points); % Units: V/m
%Magnitude of Electric Field
Emag = zeros(1,numpoints);
for m=1:numpoints
    Emag(m) = norm(E(:,m)/sqrt(2));
end
Emag = 20*log10(reshape(Emag,length(y),length(x))); % Units: dBV/m
Emag = Emag + 120; % Units: dBuV/m
%Plot of Antenna Electric Field
d_min = min(Emag(:));
d_max = max(Emag(:));
del = (d_max-d_min)/12;
d_vec = round(d_min:del:d_max);
if isvalid(f)
    close(f)
end
figure
contourf(X*1e-3,Y*1e-3,Emag,d_vec,'showtext','on')
title('Field Strength (dB\muV/m) on flat Earth (1V tx)')
xlabel('lateral (km)')
ylabel('boresight (km)')
c = colorbar; 
set(get(c,'title'),'string','dB\muV/m')
%Transmitter Site with Antenna
lat =  -24.59;
lon = 25.89;
h = 15;
az = -150;
xyrot = wrapTo180(az - 90);
%Define a transmitter site with the antenna and orientation defined above.
tx = txsite('Name','Antenna Site', ...
    'Latitude',lat, ...
    'Longitude',lon, ...
    'Antenna',ant, ...
    'AntennaHeight',h, ...
    'AntennaAngle',xyrot, ...
    'TransmitterFrequency',f0);
names = "Fenway Park";
lats = -24.89;
lons = 25.87;
sens = -90;
rxs = rxsite("Name",names, ...
      "Antenna",dipole,"Latitude",lats, ...
      "Longitude",lons, ...
      "ReceiverSensitivity",sens);
%show(rxs)
%Calculate Transmitter Power
Z = impedance(tx.Antenna,tx.TransmitterFrequency);
If = feedCurrent(tx.Antenna,tx.TransmitterFrequency);
Irms = norm(If)/sqrt(2);
Ptx = real(Z)*(Irms)^2;
tx.TransmitterPower = Ptx;
%Display Electric Field Coverage Map with Multiple Contours
% Launch Site Viewer with no terrain
%viewer = siteviewer("Terrain", "none");
sigStrengths = [9 14 19 24 29 36];
coverage(tx,rxs,'freespace', ...
    'Type','efield', ...
    'SignalStrengths',sigStrengths, ...
    'Colormap','parula', ...
    'ColorLimits',[9 36])
%Customize Site Viewer
viewer.Basemap = 'topographic'; 

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Answer 1

Prateek 2022-12-27

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1882517-matlab-out-of-memory-problem#answer_1136742

Hello Gophela,

Thanks for sharing your code. I was able to execute it in my system, and it produced results without any error (screenshots depicted below).

This leads me to suspect that this issue is due to limited memory in the system you are using. Thus, upgrading to a system with higher memory is likely to resolve this issue at your end.

Hope this helps.

Regards,

Prateek