i want to use the parameters inside the loop in function circleintersection after the loop and the error was (referance to cleared variable)wt can i do???

if d(1,m)<R

            circlequ(netXloc(j),netYloc(j),50,1000); 
          x(1,n)=netXloc(j)
          y(1,n)=netYloc(j)
          r=50.*ones(1,length(x));
          n=n+1;  
        end
       [a,b]=circleintersection(x,y,r);

Answer 1

[David Young]

Variables are not automatically cleared at the end of a loop. There is some other problem, which cannot be diagnosed from the code fragment you have posted. Maybe you clear d, R, m, or j before the loop begins? Use breakpoints, or just print out some values, in order to find out what variable has not got a value.

[SAM alimostafa]

i print out the values of x,y and r on the workspace and it has a result this is the whole code:

clc;

clear all;

close all

noOfNodes = 100;

rand('state', 0);

figure(1);

clf;

hold on;

L = 1000;

R = 100; % maximum range;

netXloc = rand(1,noOfNodes)*L;

netYloc = rand(1,noOfNodes)*L;

dis=zeros(noOfNodes,1);

A=[netXloc' netYloc'];

for i = 1:noOfNodes

plot(netXloc(i), netYloc(i), '.');

text(netXloc(i), netYloc(i), num2str(i));

end

for t=300:100:300

x1=t;% we can change this function so the target path will be change

y1=t;

m=1;

n=1;

x=[];

y=[];

r=[];

for j=1:noOfNodes

d(1,m)=sqrt((x1-netXloc(j))^2+(y1-netYloc(j))^2);

if d(1,m)<R

circlequ(netXloc(j),netYloc(j),50,1000); %draw circle around the sensed sensors

x(1,n)=netXloc(j)

y(1,n)=netYloc(j)

r=50.*ones(1,length(x));

n=n+1;

end

[a,b]=circleintersection(x,y,r);

dis(j)=d(1,m); %distance from target and each node

m=m+1;

end

end

plot(a,b)

hold on

grid