Index exceeds matrix dimensions

this is my code:

pathloss2 = zeros(50,8);
f      = 2500;
height = 5;   % height of the base station(b/w 10 t0 80 meters)
do     = 100; % constant

% d=500; %d>do
% s=8; % typical value of standard deviation (b/w 8 and 10 dB)

wavelength  = 3.0e+8/f;
atype       = 4.6; % model parameters
btype       = 4;
ctype       = 3.6;
gamma       = (atype-btype*height+ctype/height);
A           = 20*log10(4*3.14*do/wavelength);
deltaPLf    = 6*log10(f/2000);
deltaPLh    = -10.8*log10(height/1.5);

UserLocationX = randi(50, 1, 50);
UserLocationY = randi(50, 1, 50);
AccessPointX = randi(50, 1, 8);
AccessPointY = randi(50, 1, 8);
dis = sqrt((UserLocationX(:,1)-AccessPointX).^2 + (UserLocationY(:,2)-AccessPointY).^2);
for k=1:50
    for l=1:8

PL  = A+10*gamma*log10(dis(k,l)/do*1000);
pathloss2(k,l)= PL + deltaPLf + deltaPLh + 30;

      end
  end

Answer 1

[Image Analyst]

Bring dis inside the loop. Try this:

UserLocationX = randi(50, 1, 50);
UserLocationY = randi(50, 1, 50);
AccessPointX = randi(50, 1, 8);
AccessPointY = randi(50, 1, 8);
for k=1:50
  for l=1:8    
    distance = sqrt((UserLocationX(k)-AccessPointX(l)).^2 + (UserLocationY(k)-AccessPointY(l)).^2);
    PL  = A+10*gamma*log10(distance/do*1000);
    pathloss2(k,l)= PL + deltaPLf + deltaPLh + 30;    
  end
end

[abdulaziz alofui]

does not work ......its same problem

[Walter Roberson]

Which line is the error showing up on, and what is the exact error message?

[abdulaziz alofui]

Index exceeds matrix dimensions.

this line : PL = A+10*gamma*log10(distance(k,l)/do*1000);

[Image Analyst]

That's not the code I gave you!!!!

Answer 2

[Sara]

The variable dis is 1 by 8 while you ask the code to access dis(k,l) with k from 1 to 50

[abdulaziz alofui]

no the variable dis its mean the distance b/w 50 random userlocation and 8 random access point

[Sara]

I ran the code as is and that's what acme out. You'll need to change that variable expression if it is not what you expected.

Answer 3

[Walter Roberson]

UserLocationX = randi(50, 1, 50) is going to build UserLocationX as a row vector. UserLocationX(:,1) then asks for a particular column out of that row vector, and since there is only one row in the row vector the result is going to be a scalar.

Watch out for row versus column access.