How to make a xlsx file to a comma delimited csv file?

I need to covert a xlsx file to a comma delimited csv file. writematrix is not a good option as its input is matrix and in my case the data look like this:

Answer 1

[Walter Roberson]

readtable and writetable

[Zeynab Mousavikhamene]

How to make it vice versa? I have csv file and want to convert to xlsx. The file looks like the above image.

[Walter Roberson]

readtable and writetable again. Both of them can read and write csv and xlsx. There are some differences on the ability to write into selective locations, so which you are using for output can matter, but for this particular purpose the code is simple (provided that the column headings are valid matlab variable names; if not then newer matlab can handle the situation but not older matlab)