How to save content in csv on specific row and column?

Ui.Vision HowTo
1

I know csvReadArray can read specific row and column, but how to save content in csv on specific row and column? Such as [1][4]

2

after read by csvReadArray make copy of it change by javascript and then save by csvSaveArray…
by this you can change specific cell of csv like arr[1][7]

3

Hello, do you have an example to teach me how to be done this?