How can I run a previously used function using a pushbutton?

So I'm writing a code that will ask a user to input a matrix. It will then show them the matrix in a table, and ask them if it is correct. There will be a 'Yes' and a 'No' button. If they click the 'Yes' button, it will simply close the program. If they click the 'No' button, I would like it to go back and run the original function again, which asks them to input a matrix. I'm very confused, as I can't seem to figure out how you're supposed to do this, but it feels like this should be fairly easy... How can I make a pushbutton initiate a function which has already been used, without rewriting the entire function again? I can include my entire code if necesary, but it is rather lengthy, and all of it works properly except for the 'No' button. Basically my question comes down to this: Assuming that I write a rather lengthy function:

function matrix_input %Generate the actual window prompt
~ ~ ~ ~ ~ Lots of stuff going on in here including creating a window to input the matrix, and a 'submit' button
~ ~ ~ ~ ~
end

Which then opens up a second gui which displays the matrix and has the 'yes' and 'no' buttons:

function submitbtn_Callback
~ ~ ~ ~ Lots of stuff going on in here, including the creation of a 'matrixdisplay' window which has the two buttons on it
~ ~ ~ ~
end

How can I, later on, call back this function without needing to rewrite it all? I don't have any idea how to write this, but my best guess was something like this:

function nobtn_Callback(~, ~, matrixdisplay)
    function matrix_input
    end
end

In English, it'd be something like:

When nobtn is pressed, go to the function 'matrix_input' and do it again

I'm super lost, I feel like this should be relatively easy, so any help would be greatly appreciated!

[Geoff Hayes]

Chris - are you using GUIDE to create your GUI(s)? Under what condition does matrix_input launch the second GUI? Finally, can't the nobtn_Callback just call the main program, matrix_input again (and close itself)?

Answer 1

[Chris Gnam]

I figured it out! All I need to do is put:

function nobtn_Callback(~, ~, matrixdisplay)
    run matrix_input
end

And it worked perfectly!