Hi, please tell me more about waht you want to do. What I do is use a function called xlswrite as follows:
xlswrite("File.xlsx",var,1,'A1:C2')
Here "File.xlsx" is the name of the file, var is what you want to write on Excel, 1 is the sheet, and 'A1:C2' is the range of cells where the information is going to be written.
It creates a file with that name or edits the file with that specific name (it has to be in the same folder).
I hope this is what you need. I use transferring data between Excel and Matlab a lot.
Also, if you still find trouble with it, continue this thread so I can help you more and other people with the same issue can look up to this. I spent a lot of time researching on how to use these formulas. Also, I don't know if they work in Matlab online, but isnce you are using App Designer, there is no problem.
