how can i remove the error

i typed my code ... when i let it run than it posts a error an matlab is closed down

my code:

clc
clear all 
close all 
format long g 
%%Hausübung - Bedingte Ausgleichung 
% Ausgleichender Kreis

syms x  xm_k y  ym_k r_k

f = (x-xm_k)^2+(y-ym_k)^2-r_k^2;
% Jacobi matrix d Unbekannten 
dfdxm= diff(f,xm_k)
dfdym= diff(f,ym_k)
dfdr= diff(f,r_k)
% Jakobi matrix d Beobachtungen 
dfdx=diff(f,x)
dfdy=diff(f,y)

% 12 Kreispunkte manuell eingemessen Beobachtungen :
Punkte= [43.594, 24.424;
       25.427,43.020;
        0.440,49.961;
      -24.627,43.473;
      -43.018,25.438;
      -49.995,0.550;
      -43.571, -24.550;
      -25.444, -43.087;
      -0.397, -50.054;
       24.522, -43.620;
       43.163, -25.272;
       50.003, -0.230];
   b= [43.594;
       24.424;
       25.427;
       43.020;
        0.440;
       49.961;
      -24.627;
       43.473;
      -43.018;
       25.438;
      -49.995;
       0.550;
      -43.571;
      -24.550;
      -25.444;
      -43.087;
      -0.397;
      -50.054;
       24.522;
      -43.620;
       43.163;
      -25.272;
       50.003;
      -0.230];

% Näherungswerte für Unbekannte:
xm_k=0;
ym_k=0;
r_k=50;

% Qbb handschriftlich bestimmt Varianz 1 und Kovarianz 2 

Qbb= zeros(length(b));
for r=1:length(b)
  Qbb(r,r)=2;
end
for r = 1:length(b)-1
  if mod(r,2)~=0
      Qbb(r+1,r)=1;
  elseif mod(r,2)==0
      Qbb(r+1,r)=0;
  end
  if mod(r,2)~=0
     Qbb(r,r+1)=1;
  elseif mod(r,2)==0
     Qbb(r,r+1)=0;
  end
end

% Erestellen der Jacobi Matrix d Unbekannten : A
A=[];
B1=[];

for i=(1:length(Punkte))
x = Punkte(i,1);
y = Punkte(i,2);
dfdxm1= eval(subs(dfdxm));
dfdym1= eval(subs(dfdym));
dfdr1=  eval(subs(dfdr));
A=[A;dfdxm1,dfdym1,dfdr1];
dfdx1 = eval(subs(dfdx));
dfdy1 = eval(subs(dfdy));
B1=[B1;dfdx1,dfdy1];

   %B(k,j)=dfdx1;
   %B(k,j+1)= dfdy1;
  % j=j+2;
end
j=1;
B=zeros(12,24);
for k=1:12
    B(k,j)=B1(k,1);
    B(k,j+1)=B1(k,2);
    j=j+2;
end

w=[];
for i = 1:length(Punkte)
x = Punkte(i,1);
y = Punkte(i,2);

w1= eval(subs(f));
w=[w;w1];
end

dx_dach=-(inv(A'*inv(B*Qbb*B')*A))*A'*inv(B*Qbb*B')*w;

Answer 1

[Image Analyst]

For fatal crash and burns like that, see the FAQ: http://matlab.wikia.com/wiki/FAQ#After_installation.2C_MATLAB_crashes_or_gives_an_error_message_when_I_try_to_run_MATLAB. - basically, call the Mathworks.

[franziska]

i havent found an solution for my Problem it is normaly non. the Programm run till i multiplicate 2 matrices than throws the error... by my friend when he tips my code in his Programm it works ....^^

[Image Analyst]

Are you using any third party executable files like DLLs? Or is it all just straight out-of-the-box MATLAB code? There could be many complicated reasons for such a crash and we aren't able to troubleshoot much, which is why the FAQ recommends you contact the Mathworks.