index exceed matrix dimension error

hello this is my code and when i run it i get the error index exceed matrix dimension. i cant figure out the error so anyone can help?

[m,n]=size(I0);
M=0.5*ones(4,3);

M(1,2)=0.5*cos(2*0);
M(1,3)=0.5*sin(2*0);
M(2,2)=0.5*cos(2*0.61);  
M(2,3)=0.5*sin(2*0.61);
M(3,2)=0.5*cos(2*1.57);
M(3,3)=0.5*sin(2*1.57);
M(4,2)=0.5*cos(2*2.71);
M(4,3)=0.5*sin(2*2.71);
M=double(M);

%reconstruction surface
S0=zeros(m,n);
S1=zeros(m,n);
S2=zeros(m,n);
S3=zeros(m,n);

disp('calculate stokes')
for i=1:m
    for j=1:n
        I=double([I0(i,j);I35(i,j);I90(i,j);I155(i,j)]);
        S=linsolve(M,I);
        S0(i,j)=S(1,1);
        S1(i,j)=S(2,1);
        S2(i,j)=S(3,1);
    end
end

ro=sqrt(S1.*S1+S2.*S2)./(S0+eps);

AzimuthalAngle=0.5*atan(S2./(S1+eps));  

disp('mask')
MASQUE=OuvreMasque_2011('masque.png',I0) %imread('masque 1629.jpg');
MASQUE=im2bw(MASQUE);
%contourf(ro.*MASQUE);
disp('rho, phi')
ro=min(abs(ro),0.90);

ZenithalAngle=zeros(m,n);
nc=8;
options=optimset('Display','notify');
kc=fsolve(@(t)(2*nc*(1/(1+2*nc+nc^2+t^2)+1/(nc^2+t^2+2*nc+1))-0.37),1,options);
count=m*n;
for i=1:m 
      for j=1:n
      * _if MASQUE(i,j)==1_ *
          ZenithalAngle(i,j)=fsolve(@(t)((nc^2+kc^2-1)*(1-cos(t)^2)/((nc^2+kc^2+1)*(1+cos(t)^2)+4*nc*cos(t))-ro(i,j)),0.5,options);
      end
      count=count-1;
   end
end

it is stated that the error is 'if MASQUE(i,j)==1'.

[dpb]

What is

size(MASQUE)

and

m, n

at that point?

doc debug

on setting breakpoint and using the debugger to sort out such problems.

As a general rule, copy and paste the full text of the error in context of the code rather than just paraphrasing a small portion of it.

[Image Analyst]

You forgot to include your error message ( all the red text) you just snipped out a small, nearly useless part of the error message. Also, please look at this, which will solve your problem for you: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

[bourgogne]

below is the error message i get. the size at that point is 308,236. the size is not fixed as the code prompt user to crop image to get the cropped size.

??? Index exceeds matrix dimensions.

Error in ==> Topo at 58
      if MASQUE(i,j)==1

Error in ==> kek_13_5_2014>pushbutton2_Callback at 212
Topo(handles);

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> kek_13_5_2014 at 21
    gui_mainfcn(gui_State, varargin{:});

Error in ==>

@(hObject,eventdata)kek_13_5_2014('pushbutton2_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

[dpb]

...the size at that point is 308,236. the size is not fixed as the code prompt user to crop image to get the cropped size.

And what were/are m and n? Doesn't look like you update them anywhere to match this cropped (reduced) image size. Again, use the debugger...

[bourgogne]

alright thanks very much i will try to use the debugger and see.

Answer 1

[Sean de Wolski]

dbstop if error

Will stop when the error occurs so you can inspect every variable at the time of the error. It should then be obvious what is exceeding the size.