check if tab exist

if ~isappdata(app.Tab_Instrum_Aggreg)

Predator_CreaOggetti_Instrument_Struct(app);

end

Error using isappdata

Not enough input arguments.

this is reserver world:

tf = isappdata(obj,name)

but name what is?

[Rik]

The documentation states: "Name identifier of the data, specified as a character vector or string scalar. This identifier is the same name identifier passed to setappdata during the storage operation."

But you seem to be confusing this function with accessing a property in AppDesigner. This function was introduced 2 decades before AppDesigner was released. I doubt you need it here.

What do you want to do? You really need to start improving your questions. Formatting and a longer explanation of the context of what you have and what you want help a lot. It can even help you answer your question before you post it.

[Luca Re]

i want check if app.Tab_Instrum_Aggreg exist or not

(app.Tab_Instrum_Aggreg is created using copyobj)

Answer 1

[Voss]

"i want check if app.Tab_Instrum_Aggreg exist or not"

isprop(app,'Tab_Instrum_Aggreg')