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???

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SAM alimostafa
SAM alimostafa 2011-3-23
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);

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回答（1 个）

David Young
David Young 2011-3-23
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.
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SAM alimostafa
SAM alimostafa 2011-3-23
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

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