Index exceeds matrix dimensions Error

Hello

I am trying to access data from a document and the data gets imported correctly. The array for data is a 20 x 20 size array, but when I try to access row 2, it gives the index exceeds matrix dimensions error.

Here is my code:

figure(1);
markers=['+' 'o' '*' '.' 'x' 's' 'd' '^' 'v' '<' '>' 'p' 'h'];
location = 1;
disp(size(data()));
for i=1:num_trials
    for j=1:num_sensors
        col = 5 + (j-.5) * 2;
        plot(location * ones(size(data(:,col,i))),data(:,col,i),'.'); hold on;
    end
    location = location+1;
end
grid on;

The specific line generating the error is: plot(location * ones(size(data(:,col,i))),data(:,col,i),'.'); hold on;

Answer 1

[James Tursa]

If "data" is 20x20, why are you indexing into it as a 3D array? E.g.,

data(:,col,i)

What are the values of num_trials and num_sensors? That could be another source of problems.

[Cory Morales]

num_trials is 10 and num_sensors is 8

I had the colon there because i needed to get everything out of that location for the data collection. What would be a better way to do this?

[James Tursa]

What is "data"? A double array, cell array, or what?

[Cory Morales]

double with 1x1 struct cells of unknown struct type

[James Tursa]

This is not clear to me. Is it a struct with fields that are cell arrays that contain double arrays? Or what? E.g., what does class(data) return?

[Cory Morales]

Data is taking in sensor data from a sensor strip. For example, when i run disp(data) i get:

Columns 1 through 10

          10           2           1         119          28        4559         101        4570          58        4457
          10           2           2         119          28        4545         100        4581          58        4450
          10           2           3         119          29        4562         101        4572          58        4444
          10           2           4         119          29        4552         102        4570          58        4444
          10           2           5         119          28        4553         101        4566          58        4442
          10           2           6         119          27        4557         100        4577          56        4456
          10           2           7         119          26        4557          99        4570          56        4446
          10           2           8         119          27        4555         100        4573          56        4455
          10           2           9         119          27        4550         100        4575          56        4450
          10           2          10         119          26        4560          99        4569          55        4449
          10           2           1         119          28        4559         101        4569          58        4455
          10           2           2         119          28        4564         101        4576          57        4452
          10           2           3         119          28        4557         100        4577          57        4445
          10           2           4         119          28        4557         100        4587          57        4449
          10           2           5         119          27        4554          99        4573          57        4447
          10           2           6         119          28        4559          99        4577          57        4451
          10           2           7         119          27        4558          99        4565          56        4455
          10           2           8         119          27        4552          99        4567          57        4441
          10           2           9         119          27        4552         100        4577          57        4453
          10           2          10         119          27        4556         100        4579          57        4449

Columns 11 through 20

         147        4614         288        5109          98        4417         195        4478         188        4390
         147        4612         287        5106          98        4419         195        4486         188        4398
         147        4613         287        5107          98        4408         195        4481         189        4389
         148        4611         287        5111          98        4413         195        4486         188        4395
         147        4614         287        5102          98        4410         194        4485         187        4390
         146        4606         285        5106          97        4415         193        4479         187        4398
         145        4607         285        5107          97        4417         194        4481         188        4395
         145        4617         285        5111          97        4420         194        4479         188        4392
         145        4612         285        5109          97        4412         193        4479         188        4392
         145        4614         284        5107          96        4413         194        4476         189        4391
         147        4609         286        5108          98        4421         195        4471         191        4392
         147        4613         286        5105          97        4414         195        4478         191        4389
         146        4613         286        5110          97        4412         194        4479         190        4392
         147        4613         286        5105          97        4407         195        4480         190        4400
         147        4609         286        5105          97        4415         195        4479         189        4393
         146        4614         286        5102          97        4420         195        4473         191        4391
         146        4600         286        5106          97        4418         195        4473         190        4391
         146        4618         286        5110          98        4418         195        4474         191        4404
         147        4611         286        5106          97        4415         195        4490         190        4397
         146        4608         286        5102          97        4416         195        4473         191        4399

[James Tursa]

If class(data) returns 'double', what does the phrase "struct with fields that are cell arrays that contain double arrays" mean specifically?

[Cory Morales]

Actually, I think it works now. Thanks!