How to clear file name and file path information?

Most variables can be cleared by

var = [];

When I treid to do the same thing for my file name and path like below:

app.File.Value = [];
app.Path.Value = [],

I get this error:

Error using matlab.ui.control.EditField/set.Value
'Value' must be a character vector or a string scalar.

What is a better way of clearing these two variables? Thanks!

Answer 1

[Walter Roberson]

Use '' or "" as the value instead of []

[Leon]

I didn't know it is as simple as that. Many thanks!