DIGIKON: The direct digital control system analysis program for shuttle

The degree of reliance a control system analyst can place on computer solutions of systems equations is critically dependent on the computational algorithms selected, and the care employed in programming to control error propagation. This paper describes characteristics of practical systems influencing the choice of algorithms and error control and offers suggested precautions. It is based on experience in the development of a system for linear analysis of large scale systems involving discrete control with multiple sampling rates.