VOBcal: variant of bracketing method calculator

A variety of real-world problems can be in the form of root findings or non-linear equations. The solution to such non-linear problems can be obtained either analytically or numerically. However, analytical methods are quite complicated and difficult to be conducted. Although the numerical method offers fast and less time-consuming solutions, it requires initial guesses and repetitive calculations. Thus, there is a need to simplify all the processes to enhance the efficiency and reduce human error. Generally, there are a lot of existing and available mathematical software that can be used to solve non-linear problems. However, some consumers are always concerned about the cost of the license. Therefore, the use of a graphical user interface, which can provide a user-friendly method of entering parameters and presenting results, is one approach to solve this. The VOBcal, also known as the Variant of Bracketing method calculator, is a standalone application developed using MATLAB App Designer that uses bracketing methods to determine the root of a function. The interface of VOBcal contains five different variants of bracketing methods which are Bisection, Modified Bisection Algorithm, Trisection, and Regula Falsi programmed together with MATLAB built-in function named fzero. VOBcal can be used as a mathematical tool for research and development (R&D) purposes as well as providing effective learning and educational support for academics and researchers.