How to create a simple GUI for Gaussian elimination with partial pivoting?

I have a code written as a function to solve a matrix via Gaussian elimination with partial pivoting. To use the code you assign A as the coefficient matrix and b as the right hand column matrix. I don't quite understand how to make a GUI with GUIDE. All I need is 2 entry boxes where you enter A and b, a button to run the Gauss elim function, and 3 boxes that display the answer (I will be using it to solve a 3x3 matrix). I don't understand how to make boxes that will allow the user to enter A and b and have them be used by the function i created when you push the button. I also don't understand how to have the answer displayed in separate boxes. Any help or guidance will be much appreciated.