## Error using ==> plus Matrix dimensions must agree.

### rakesh balusa (view profile)

on 19 Sep 2013

Dim=size(DataSet);

%----------------------- Selecting 3 random centres ----------------------% Selection=rand(1,3); Selection=Selection*Dim(1,1); Selection=ceil(Selection); %Selecting the row number.

%--------------------------- 3 random centres ----------------------------% Centre1=DataSet(Selection(1),:); Centre2=DataSet(Selection(2),:); Centre3=DataSet(Selection(3),:);

n=input('No Of Iterations : ') %----------------------- Partitional Algorithm ---------------------------% %-------------------------- K means Algorithm ----------------------------% for j=1:1:n count1=0; Mean1=zeros(1,4); count2=0; group1=[]; Mean2=zeros(1,4); group2=[]; count3=0; group3=[]; Mean3=zeros(1,4);

%Finding the minimum distance for i=1:1:Dim(1,1)

Pattern1(i)=sqrt((Centre1(1,1)-DataSet(i,1))^2+(Centre1(1,2)-DataSet(i,2))^2+(Centre1(1,3)-DataSet(i,3))^2+(Centre1(1,4)-DataSet(i,4))^2); Pattern2(i)=sqrt((Centre2(1,1)-DataSet(i,1))^2+(Centre2(1,2)-DataSet(i,2))^2+(Centre2(1,3)-DataSet(i,3))^2+(Centre1(1,4)-DataSet(i,4))^2); Pattern3(i)=sqrt((Centre3(1,1)-DataSet(i,1))^2+(Centre3(1,2)-DataSet(i,2))^2+(Centre3(1,3)-DataSet(i,3))^2+(Centre1(1,4)-DataSet(i,4))^2);

LessDist=[Pattern1(i) Pattern2(i) Pattern3(i)]; Minimum=min(LessDist);

%Finding the new centre if (Minimum==Pattern1(i)) count1=count1+1; Mean1=Mean1+DataSet(i,:); group1=[group1 i]; else if (Minimum==Pattern2(i)) count2=count2+1; Mean2=Mean2+DataSet(i,:); group2=[group2 i]; else count3=count3+1; Mean3=Mean3+DataSet(i,:); group3=[group3 i]; end end

end

%----------------------------- New Centres -------------------------------% Centre1=Mean1/count1; Centre2=Mean2/count2; Centre3=Mean3/count3; plot(j,count1,'r'); hold on plot(j,count2,'g'); plot(j,count3,'b');

end

hold off % specify the indexed color for each point icolor = ceil((DataSet(:,4)/max(DataSet(:,4)))*256);

figure, scatter3(DataSet(:,1),DataSet(:,2),DataSet(:,3),DataSet(:,4),icolor,'filled'); figure,

scatter3(DataSet(:,1),DataSet(:,2),DataSet(:,3),[],DataSet(:,4),'filled')

Jan Simon

### Jan Simon (view profile)

on 19 Sep 2013

Posting the complete error message is a good method to allow the readers to recognize which line causes the problem. We cannot guess such details, but we cannot run you code also due to the missing input file.

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### Jan Simon (view profile)

on 19 Sep 2013

The debugger is the right tool to solve such problems:

```dbstop if error
```

The start your function again. When it stops check the dimensions of the local variables e.g. by typing "size(...)" in the command window.

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