I am currently doing my bachelors in Mechanical engineering engineering and planning to pursue physics after completion. I have to choose an elective the coming semester. One of the electives offered is 'Numerical Methods for Engineers' and the modules covered include Error in numerical calculations, Solution of system of linear algebraic equations, Numerical differentiation and Boundary value problems. Is this subject useful for a theoretical physicist? Can you mention any applications of numerical methods you have seen in your career as a physicist?