Why does the sum of S1 AND S2 ?

S1=[23.6000 58.4000 47.4000 101.7000 29.9000 36.8000] S2=[23.6000 58.4000 47.4000 67.1000 29.9000 71.4000]

c=0; while (S1~=S2)

    c=S1+S2

end

c

Why does the sum of S1 AND S2 ?

Thanks.

Answer 1

[Azzi Abdelmalek]

Maybe you want

S1=[23.6000   58.4000   47.4000  101.7000   29.9000   36.8000]
S2=[23.6000   58.4000   47.4000   67.1000   29.9000   71.4000]
c=0;
while ~isequal(S1,S2)
  c=S1+S2
end

[John D'Errico]

I think you misunderstand how while works. It cannot loop over the elements of S1 as you have written it.

[Azzi Abdelmalek]

I don't know what you want. Can you explain?

Answer 2

[Walter Roberson]

Your while loop does not change S1 or S2, so the body will either not be done at all (if the condition does not hold at the beginning) or will be done repeatedly without end.

[Tomas]

THIS IS MY FULL CODE, i don't know to set the while loop, when i have T=6; while not count correctly

clear,clc

MON = [2.8 3.6 17.2;
        5.4 8.3 15.8;
        2.5 3.2 17.6;
        9.9 10.7 13.6;
        5.5 8.9 15.5;
        9.7 11 13.9;
        2.3 3.9 17.9;
        5.7 8.1 15.1;
        9.4 10.5 13;
        9.9 13.2 13.7];

      [m,n]=size(MON)

      T=input('Zadaj počet typickych bodov :')%uzivatel zada koľko chce mať typickych bodov
         for i=1:T %Pociatocne typicke body

          TAZ=MON(1:T,:);

      end

      TAZ

       [r,s]=size(TAZ)%rozmery TAZ

       Z=cell(1,T)%vytvorenie zhlukov

z=1;

          for i=1:m
       for j=1:r

      B = MON(i,:);

      Z1(j)= euklid6(TAZ(j,:),B);%euklidovska vzdialenost

       end

        Z1

        minD = min([Z1]);%minimalna hodnota
        [i_min,j_min]=find(Z1==minD);%indexacia minimalnej hodnoty

        [e,f]=size(Z1);

        %postupne ukladanie podla prislusnosti objektu do zhlukov
        for h=1:f
            if (Z1(h) == Z1(j_min))

            Z{h}{z}=B;
            z=z+1;
            end
        end

       end

        Z;   

        d1=length(Z)

        for i=1:d1 %zmaze prazdne miesta v poli
            Z{i}(cellfun(@isempty,Z{i})) = [];
        end
        Z

      [z1,z2]=size(Z)

      Znew={};%nove pole 

        for j=1:z2

          S1(j)=sucet1(Z(j));

      end

      S1

    S2=0; 

     iter=1;

     while (S1(:,:)~=S2(:,:)) % this while loop is not correctly

        [t1,t2]=size(Z);%rozmery Z

     for j=1:t2
     d(j,:)=tazisko6(Z(j));%vypocet noveho taziska

   end

     d 

[x,y]=size(d)%rozmery d

    w=1;

for i=1:m
 for j=1:x

         B = MON(i,:);

     Z1(j)= euklid6(d(j,:),B);%euklidovska vzdialenost

       end

        Z1

         minD = min([Z1]);%minimalna hodnota
        [i_min,j_min]=find(Z1==minD);%indexacia minimalnej hodnoty

        [e,f]=size(Z1);%rozmery Z1

          %postupne ukladanie podla prislusnosti objektu do zhlukov
        for h=1:f
            if (Z1(h) == Z1(j_min))

            Znew{h}{w}=B;
            w=w+1;
            end
        end

       end

        Znew;

         d2=length(Znew);%zmeria dlzku pola

        for i=1:d2 %zmaze prazdne miesta v poli
            Znew{i}(cellfun(@isempty,Znew{i})) = [];
        end
        Znew;

        Z=Znew

        [b1,b2]=size(Z);

           for j=1:z2

          S2(j)=sucet1(Z(j));

      end

      S2

        iter=iter+1;

       end

        clear,clc

        function [d] = tazisko6(A)
  %%[d] = tazisko6(A)
  %
  % Tazisko jednotlivych zhlukov(centroid)

d1=length(A);
d2 =length(A{1});

     s=0; 
     for i=1:d1
         for j=1:d2

             s=s+(A{i}{j});

         end
         if d2~=1
         d=s/d2;
         else

         d=s;
         end

     end

function [ d] = euklid6( A,B )
%%[d] = euklid(A,B)
%
% Euklidovska vzdialenost bodov
[hA,tA]=size(A);
[hB,wB]=size(B);
if hA==1&hB==1
    d=sqrt(dot((A-B),(A-B)));
else
    C=[ones(1,hB);zeros(1,hB)];
    D=flipud(C);
    E=[ones(1,hA);zeros(1,hA)];
    F=flipud(E);
    G=A*C;
    H=A*D;
    I=B*E;
    J=B*F;
    d=sqrt((G-I').^2+(H-J').^2);
end

end

function [ S1 ] = sucet1( Z1 )

%%S1=sucet(Z1)
n1=length(Z1);
n2=length(Z1{1});

u=0;

for i=1:n1

      for j=1:n2

          u=u+sum(Z1{i}{j});

      end
     S1(i)=u;

end

end

THANKS

[Walter Roberson]

Okay, in that code your while does appear to be changing S2, at least under some conditions. (I have not tried to figure out what the code is intended to do.)

I would suggest though that you read,

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[Tomas]

i don't understand english very well :)

[Walter Roberson]

A = 0.3 - 0.2 - 0.1;
B = 0;
if A == B
  disp('the two are equal')
else
  disp('the two are not equal')
end
if abs(A-B) < eps(0.3)
  disp('the two are approximately equal')
else
  disp('the two are not approximately equal')
end

Do not compare floating point numbers for equality.

Also, you are comparing two arrays. Read the documentation for "if"

An evaluated expression is true when the result is nonempty and contains all nonzero elements (logical or real numeric). Otherwise, the expression is false.