Create an array in a GUI

I want to create an array in a GUI to store data so I can export it, but can't find a way to store the data using app designer

i = 1

when button pushed

while true
    App.Value1 = A + B;
    App.Value2 = A + C;
    store(i) = [App.Value1 App.Value2];
    i = i + 1;
end

[Jan]

The question is not clear. This is an infinite loop, which creates a growing array called "store" containg the same values repeatedly. What is A, B and C? Where do you want to "store" the values? What is the purpose of the code? Why do you want to use a loop?

[SETH GERSBACH]

Sorry I was a bit vague, I was tired.

Text = fopen('document')
B = 2;
C = 5;
i = 1

when button pushed

for i > 20
    A = read(Text)
    App.Value1 = A + B;
    App.Value2 = A + C;
    store(i) = [App.Value1 App.Value2]; %stores data in array
    i = i + 1;
end
export(store);

[Jan]

I've formatted the code of your comment. Please do this by your own in the future to improve the readability.

You still did not ask a question. What is the purpose of "Text = fopen('document')" or "A = read(Text)"? For loops do not look like this in Matlab:

for i > 20
    i = i + 1
end

So I still have no idea, what you want to achieve.