GUI solver for nonlinear algebraic equation systems using fsolve

MATLAB fsolve is frequently used to solve nonlinear algebraic equation systems. This utility makes it simple. User enters initial guesses and equations. The equations will be solved automatically after user clicks the Run button. Residual values are also displayed for user to judge the quality of the answers. User can input a .txt file containing equations instead of entering them on the screen. As a teaching tool, an m-file can be generated in the File menu to show the inner-working behind the GUI.