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matlab out of memory problem
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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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采纳的回答
Prateek
2022-12-27
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).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1244467/image.png)
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
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