Robot4 (tm) is a Robotic Arm Movement program where the arm is moved from a given position to a desired position. The program finds the angles necessary for the desired position. Problem came from NASA. Robot4 is an Inverse Problem example. It wants to solve how to move from starting point A to target point B. Solutions to Inverse Problems are easy with Calculus programming language. See file Rob4User.fc for solution code. This is an improved productivity example do to using Calculus programming.Industry problems with solutions over the past twenty plus years have been put into a textbook to show the power of Calculus (level) Problem-Solving. The textbook as on our website at fortranCalculus.infotextbookwelcome . The software architect behind Calculus Compilers is Joe Thames (read about Joe on our About page).Help improve science and engineering productivity by supporting Joe Thames MetaCalculus University Rollout efforts visit metaCalculus.comcampaigns.html in developing MC Fortran. (There has been little if any corporate funding of Joes work for many years!) Help future science & engineers get jobs upon graduation. With MC Fortran one increases their productivity by a factor of twenty!Please visit our textbook at fortranCalculus.infotextbookwelcome and help support Calculus level compilers at metaCalculus.comcampaigns.html. Thanks!