Array changes size every time I run the code

Hi,

Im using matlab online and when I am running the code, the size/dimension of the array changes so that I get another error later in the code because the array need to be of a certain size.

The txt file is a array/list of float values with the dimensions: 99600x1. I have check the files in matlab by just opening them there and the dimension is correct there.

The problem is when I am running the code under, that the size of the arrays kx,ky,kz and ecg changes. And its not the same change every time. Sometimes some of the sizes are correct.

Anyone knows what is wrong?

Here is a image of an example. The sizes varies.

This is my code (I have also tried using readtable with a csv file instead):

kx = load("accx_mat_ex.txt");
ky = load("accy_mat_ex.txt");
kz = load("accz_mat_ex.txt");
ecg = load("ecg_mat_ex.txt");
ecgN = ecg/max(ecg);
k = kx+ky+kz;
kN = k/max(k);
whos

  Name          Size             Bytes  Class     Attributes

  ans           1x39                78  char                
  ecg       99600x1             796800  double              
  ecgN      99600x1             796800  double              
  k         99600x1             796800  double              
  kN        99600x1             796800  double              
  kx        99600x1             796800  double              
  ky        99600x1             796800  double              
  kz        99600x1             796800  double              

[DGM]

Attach the 4 files that demonstrate this behavior.

[Vegard Iversen]

They are now included.

[DGM]

I can't seem to replicate the problem. All the files consistently read with 99600 rows. I'm using R2019b.

Are these files being written immediately prior to being read, perhaps? It's not apparent why this would be happening. Maybe it's some sort of issue with the online version.

[Alagu Sankar Esakkiappan]

Hello!

I tried reproducing the issue both on R2021a offline as well as online version of MATLAB with the attached files and code sample, but couldn't reproduce the issue on both. Could you share some more details on the online Matlab version and check if uploaded data files in MATLAB online are the latest ones ?

[Vegard Iversen]

Im using R2021b update 2 (9.11.0.1847648) online version (was the only information I could find). And I am sure that the files are correct. I can see that the files are correct before I convert them into an array, and they do not change when i re-run the program.

[Alagu Sankar Esakkiappan]

Hi!

Just to be sure, Can you delete the uploaded files in Matlab Online, re-upload them and try once more ? And please attach the screenshot of workspace editor after executing the above code after re-uploading.

[Vegard Iversen]

now it seemed to work. Dont know why because its the same files.

[Vegard Iversen]

After waiting a bit, the same thing happened again. And have to delete and import the files again.

Answer 1

[Cris LaPierre]

Please contact support to report this. Be sure to include that this is only happening in MATLAB Online.