good morning everyone can anyone answer me this question ? i have an error in the matlab code

here are some of the programs that I'm working on

sou_y = [5 10]; 
rec_y = [5 25 40]; 

t_obs = [0.1000 0.0977 0.0908];
pan_ray_tot = [ 100.0000 101.9084 105.9481
                100.1249 101.1187 104.4031];
vsem = zeros (length(sou_y), length(rec_y) ); 
for i = 1 :length(sou_y)
    for j = 1 :length(rec_y)
        vsem(i,j) = pan_ray_total (i,j) ./ t_obs (i,j);
    end
end

and i have problem like this

Attempted to access t_obs(2,1); index out of bounds because size(t_obs)=[1,3].

how can i fix this?

Answer 1

[jeewan atwal]

t_obs = [0.1000 0.0977 0.0908];

This vector t_obs has only one row and three column.

when you are executing your for loop, it is trying to access value in 2nd row of t_obs. Since t_obs does not have 2nd row, thats why matlab is unable to find value t_obs(2,1).

Hope this helps in correcting your t_obs vector.

[No Freed]

thank you guys ... this is very helpful

Answer 2

[KALYAN ACHARJYA]

To avoid the error, you must define the t_obs size as 2x3

format shortG
sou_y = [5 10]; 
rec_y = [5 25 40]; 
t_obs = [0.1000 0.0977 0.0908
         0.1000 0.0977 0.0908];  % Here I have modified see, added the 2nd row example
pan_ray_tot = [100.0000 101.9084 105.9481
               100.1249 101.1187 104.4031];
vsem=zeros(length(sou_y),length(rec_y));
for i=1:length(sou_y)
    for j=1:length(rec_y)
      vsem(i,j)=pan_ray_tot(i,j)/t_obs(i,j);
    end
end
vsem

If the asumption is OK, then you can avoid loop here (Recomended)

format shortG
sou_y = [5 10]; 
rec_y = [5 25 40]; 
t_obs = [0.1000 0.0977 0.0908
         0.1000 0.0977 0.0908];
pan_ray_tot = [100.0000 101.9084 105.9481
               100.1249 101.1187 104.4031];
vsem=pan_ray_tot./t_obs

[No Freed]

thank you guys ... this is very helpful

Answer 3

[Darshan Sen]

Hello No Freed.

First error: line 10: pan_ray_total should be pan_ray_tot instead as that's the name you used at line 5.

Second error:

>> size(t_obs)

ans =

     1     3

     

But since i , t_obs must have atleast 2 rows. Since t_obs has only 1 row and in the loop, you are trying to access elements of the row indexed by i = 2, you are getting an error.

The solution is to make t_obs have atleast as many rows as length(sou_y) and as many columns as length(rec_y).

Hope this was helpful. :)

[No Freed]

thank you guys ... this is very helpful