How can I fix an 'index out of bounds because size' when the array is the right size?

When I try to run my program I get the error "Attempted to access x(1,2); index out of bounds because size(x)=[4,1].". I have checked the size of x using size(x), and I get [4,2]. Why would MATLAB be reading the size differently? Is there an error somewhere(or everywhere) in my code?

Here are my m files and the error

[Image Analyst]

Something's wrong. Why isn't line 20 of modelfun in your last picture the same as line #20 in the middle picture?

[Alexander]

Sorry, I forgot to label those screenshots. The first one is of "main", referenced in the error. The second is of "modelfun", which is called in the "main" file

[Image Analyst]

What? That's not what I'm talking about. The middle picture of modelfun say that line 20 is "x3=....." while the error message in red at the bottom says that line 20 of modelfun is "x1=.....". So which is it, x1 or x3?

Please look at this: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

[Alexander]

Oh, sorry, I misunderstood. I think I took the screenshot of the error before deleting a couple lines of unnecessary code. It is "x1=...".

Thank you for that video, it did very well to help me find the errors (there were several) in my code. I am fairly new to MATLAB and I didn't know about the debugging features.

Answer 1

[Image Analyst]

Perhaps you mixed up rows and columns. Put this before you start assigning all the x's

whos x
x
size(x)
whos k
k

[Alexander]

This, along with the other comments, helped me to pin down where I went wrong. Thank you.

Answer 2

[BMAN]

 when i am trying to run this prgram it is continously showing the error

Attempted to access BLT_elnino(1,21,1); index out of bounds because size(BLT_elnino)=[144,20,22]. how to solve this problem can anyone help me out??

temp=ncread('TEMP_ECMWFORAS41961-2015.nc','THETAO'); sal=ncread('SAL_ECMWFORAS41961-2015.nc','SO'); lat=ncread('SAL_ECMWFORAS41961-2015.nc','LAT96_115'); lon=ncread('SAL_ECMWFORAS41961-2015.nc','LON79_100'); time=ncread('SAL_ECMWFORAS41961-2015.nc','TIME'); lev=ncread('SAL_ECMWFORAS41961-2015.nc','LEV'); temp=permute(temp,[4,3,2,1]); sal=permute(sal,[4,3,2,1]);

num=datenum(1961,1:660,1,0,0,0); % create date vector str=str2num(datestr(num,'yyyy')); % create date string

el=[1965,1966,1972,1973,1982,1983,1987,1988,1991,1992,1997,1998];

la=[1973,1974,1975,1976,1988,1989,1999,2000,2007,2008,2010,2011];

El_Nino=[]; La_Nina=[]; BLT_elnino=NaN(12*12,20,22); BLT_lanina=NaN(12*12,20,22);

for i=1:144 BLT_el_avg(:,:)=nanmean(squeeze(BLT_elnino(i:144,:,:))); BLT_la_avg(:,:)=nanmean(squeeze(BLT_lanina(i:144,:,:)));

end

for i=1:144

   for x=1:22
   for y=1:20

      n=0; 
     p(x,y)=0;

 if find(BLT_elnino(i,x,y)>=0.9.*BLT_el_avg(x,y) & BLT_elnino(i,x,y)<=(1.1)*BLT_el_avg(x,y)); 

    n=n+1;
     p(x,y)=p(x,y)+BLT_elnino(i,x,y);

   end

end

   end

end composite(x,y)=p(x,y)./n;

[Image Analyst]

Is this your "Answer" to Alexander's 3-year-old original question at the very top of this page?