Error using ==> plus Matrix dimensions must agree.

Question

rakesh balusa 2013-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/87634-error-using-plus-matrix-dimensions-must-agree

load irisdataset.txt DataSet=irisdataset;

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')

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Jan 2013-9-19

编辑：Jan 2013-9-19

Please format your code properly when you want encourage others to read it. Follow the "? Help" link to learn more about formatting in this forum.

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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