How to add a few variables to an existing .mat file into a new row every time the code is run?

I have three variables a, b, c for a few test animals(say 10). I want to run the code for each animal separately to get the three variables for that animal and write it to a .mat file or a structure. When I run it for next animal, the variables are overwritten. How can I add a, b, c for the second animal in the next row and so on?

[Stephen23]

Note that it is not possible in one command to append new data to a variable already saved in a MAT file (the badly named append option should really be named the overwrite or replace option).

The best option would be to assign the data to one/three variables in the loop, and only do the saving once after the loop has finished. This would be simple with any array using indexing, or a non-scalar structure. Easy, efficient, and this is what most experienced users would do.

An alternative would be to write multiple files:

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

https://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files